Using Httpwebrequest to Submit multipart/form-data

**Joerg Jooss** · Nov 21 '05, 04:09 AM

Re: Using Httpwebrequest to Submit multipart/form-data

Gregory A Greenman wrote:[color=blue]
> I'm trying to write a program in vb.net to automate filling out a
> series of forms on a website. There are three forms I need to
> fill out in sequence. The first one is urlencoded. My program is
> able to fill that one out just fine.
>
> The second form is multipart/form-data. Unfortunately, I haven't
> been able to fill that out in a way that makes the server happy.
>
> I set up a copy of this form at my web site so that I could see
> exactly what a browser sends to the server and compare that to
> what my program sends. I saw a few mistakes in my program and I
> fixed them, but the real web site still rejects my program's
> submissions.
>
> As best I can tell, the contents that my program submits are
> identical to the contents submitted by a browser. Is there
> anything else that might be causing my problem?[/color]

Well, analyzing your problem from 10000' isn't that easy... can you provide
more details (code, error messages, ...)?

Cheers,

--
Joerg Jooss

Something With Code, Cloud and AI

https://www.joergjooss.de

news@joergjooss .de

**Sean McCormack** · Nov 21 '05, 04:16 AM

RE: Using Httpwebrequest to Submit multipart/form-data

What error message is it giving you? Is it looking for a specified set of
credentials, etc.?

Sean McCormack
Open Source for .NET

http://www.adapdev.org

"Gregory A Greenman" wrote:
[color=blue]
> I'm trying to write a program in vb.net to automate filling out a
> series of forms on a website. There are three forms I need to
> fill out in sequence. The first one is urlencoded. My program is
> able to fill that one out just fine.
>
> The second form is multipart/form-data. Unfortunately, I haven't
> been able to fill that out in a way that makes the server happy.
>
> I set up a copy of this form at my web site so that I could see
> exactly what a browser sends to the server and compare that to
> what my program sends. I saw a few mistakes in my program and I
> fixed them, but the real web site still rejects my program's
> submissions.
>
> As best I can tell, the contents that my program submits are
> identical to the contents submitted by a browser. Is there
> anything else that might be causing my problem?
>
>
> Thanks for any help.
>
>
> --
> Greg
> ----
> greg -at- spencersoft -dot- com
>[/color]

**Gregory A Greenman** · Nov 21 '05, 04:27 AM

Re: Using Httpwebrequest to Submit multipart/form-data

In article <uD7ib88rEHA.16 44@tk2msftngp13 .phx.gbl>,
joerg.jooss@gmx .net says...[color=blue]
> Gregory A Greenman wrote:[color=green]
> > I'm trying to write a program in vb.net to automate filling out a
> > series of forms on a website. There are three forms I need to
> > fill out in sequence. The first one is urlencoded. My program is
> > able to fill that one out just fine.
> >
> > The second form is multipart/form-data. Unfortunately, I haven't
> > been able to fill that out in a way that makes the server happy.
> >
> > I set up a copy of this form at my web site so that I could see
> > exactly what a browser sends to the server and compare that to
> > what my program sends. I saw a few mistakes in my program and I
> > fixed them, but the real web site still rejects my program's
> > submissions.
> >
> > As best I can tell, the contents that my program submits are
> > identical to the contents submitted by a browser. Is there
> > anything else that might be causing my problem?[/color]
>
> Well, analyzing your problem from 10000' isn't that easy... can you provide
> more details (code, error messages, ...)?[/color]

Okay. I'm getting "The remote server returned an error: (500)
internal server error".

I've got a form with two text boxes in the upper left corner,
txtHalfID and txtHalfPassword . There are three text boxes in the
upper right corner, txtISBN, txtDescription and txtPrice. There's
also a drop down combo in the upper right, cmbCondition.

The bottom portion of the screen has a read only multi line text
box called txtResponse, where the raw HTML from the server is
displayed.

Below the left text boxes is a button, btnSignOn. If you click
that button, it will sign you onto Half.com using the ID and
password in the textboxes above it. This part works fine for me.
I can see the "Welcome to eBay" page in txtResponse.

Below the right boxes is a button called btnListBook. When I
click on it it should call four web pages on half.com in order.

First it calls http://half.ebay.com/help/sell_books.cfm. It fills
in the field in the form there with txtISBN.

Next it calls http://half.ebay.com/cat/sell/pmsearch.cgi. It
fills out the form there with txtDescription and cmbCondition.
This form allows file uploads, so it's a multipart form. Although
my program's output looks good to me, I get that server error
when I submit this form.

Here's the code:

- Start Code ---------------------------------------------------
Imports System.Net

Public Class SBM
Inherits System.Windows. Forms.Form

Dim cc As New CookieCollectio n
Const encURL As Integer = 0
Const encMulti As Integer = 1

Private Sub SBM_Load(ByVal sender As System.Object, ByVal e
As System.EventArg s) Handles MyBase.Load
txtHalfID.Text = ""
txtHalfPassword .Text = ""

txtISBN.Text = "0764560255 "
txtDescription. Text = "good good"
txtPrice.Text = "99.99"

With cmbCondition
.Items.Add(New Conditions("Bra nd New", "830"))
.Items.Add(New Conditions("Lik e New", "840"))
.Items.Add(New Conditions("Ver y Good", "849"))
.Items.Add(New Conditions("Goo d", "859"))
.Items.Add(New Conditions("Acc eptable", "864"))
.SelectedIndex = 0
End With

cmbCondition.Se lectedIndex = 0
End Sub

Private Sub btnSignOn_Click (ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles btnSignOn.Click
Dim HWRequest As HttpWebRequest
Dim strURL As String
Dim HWParameters As Parameters
Dim intFound As Integer

HWRequest = GetRequest
("https://signin.ebay.com/ws/eBayISAPI.dll?S ignIn&UsingSSL= 1
&co_partnerid=2 &siteid=20")
strURL = "https://signin.half.eba y.com/ws/eBayISAPI.dll"

HWParameters = ReadResponse(HW Request, strURL)

intFound = 0

For Each p As Parameter In HWParameters
Select Case p.Name
Case "userid"
p.Value = txtHalfID.Text
intFound += 1
Case "pass"
p.Value = txtHalfPassword .Text
intFound += 1
End Select

If intFound = 2 Then
Exit For
End If
Next

HWRequest = PostRequest(str URL, HWParameters, encURL)
GetResponse(HWR equest)
End Sub

Private Sub btnListBook_Cli ck(ByVal sender As System.Object,
ByVal e As System.EventArg s) Handles btnListBook.Cli ck
Dim strPostData As String
Dim HWRequest As HttpWebRequest
Dim strURL As String
Dim HWParameters As Parameters
Dim intFound As Integer
Dim pr As Parameter

Try
HWRequest = GetRequest
("http://half.ebay.com/help/sell_books.cfm" )
strURL = "http://half.ebay.com/cat/sell/pmsearch.cgi"

HWParameters = ReadResponse(HW Request, strURL)

intFound = 0

For Each p As Parameter In HWParameters
Select Case p.Name
Case "p_code"
p.Value = txtISBN.Text
intFound += 1
End Select

If intFound = 1 Then
Exit For
End If
Next

HWRequest = PostRequest(str URL, HWParameters, encURL)

strURL = "/cat/sell/save_new_listin g.cgi"

HWParameters = ReadResponse(HW Request, strURL)
pr = New Parameter
pr.Name = "x"
pr.Value = 20
pr.Type = Parameter.Input
HWParameters.Ad d(pr)
pr = New Parameter
pr.Name = "y"
pr.Value = 20
pr.Type = Parameter.Input
HWParameters.Ad d(pr)
intFound = 0

For Each p As Parameter In HWParameters
Select Case p.Name
Case "notes"
p.Value = txtDescription. Text
intFound += 1
Case "condition"
p.Value = cmbCondition.It ems
(cmbCondition.S electedIndex).I temData
intFound += 1
End Select

If intFound = 2 Then
Exit For
End If
Next

strURL =
"http://half.ebay.com/cat/sell/save_new_listin g.cgi"

HWRequest = PostRequest(str URL, HWParameters,
encMulti)

strURL = "sell.jsp"
HWRequest.Refer er =
"http://half.ebay.com/cat/sell/pmsearch.cgi"

'the internal server error is generated in this call
'to ReadResponse
HWParameters = ReadResponse(HW Request, strURL)
intFound = 0

For Each p As Parameter In HWParameters
Select Case p.Name
Case "itemPrice"
p.Value = txtPrice.Text
intFound += 1
End Select

If intFound = 1 Then
Exit For
End If
Next

strURL = "http://half.ebay.com/cat/sell/sell.jsp"

HWRequest = PostRequest(str URL, HWParameters, encURL)

GetResponse(HWR equest)

MessageBox.Show ("Success!", MsgBoxStyle.OKO nly, "Book
Posted")

Catch ex As Exception
MessageBox.Show ("Error: " & ex.Message, "Error!!!",
MessageBoxButto ns.OK, MessageBoxIcon. Exclamation)

MsgBox("Half.co m appears to have changed its posting
procedures. As a result, this version of SBM cannot list books on
it.", MsgBoxStyle.Exc lamation, "Half.com Listing Problem")
End Try
End Sub

Private Function GetRequest(ByVa l strURL As String) As
HttpWebRequest
GetRequest = CreateRequest(s trURL)
GetRequest.Meth od = "GET"
End Function

Private Function PostRequest(ByV al strURL As String, ByVal
PostParameters As Parameters, ByVal intType As Integer) As
HttpWebRequest
Dim encoding As New System.Text.ASC IIEncoding
Dim byte1 As Byte()
Dim newStream As System.IO.Strea m
Dim strData As String
Const strBoundary As String =
"---------------------------7d4285126106b0"

PostRequest = CreateRequest(s trURL)
PostRequest.Met hod = "POST"

If intType = encURL Then
PostRequest.Con tentType = "applicatio n/x-www-form-
urlencoded"
Else
PostRequest.Con tentType = "multipart/form-data,
boundary=" & strBoundary
End If

strData = BuildRequestStr ing(PostParamet ers, intType,
strBoundary)

PostRequest.Con tentLength = strData.Length

byte1 = encoding.GetByt es(strData)

newStream = PostRequest.Get RequestStream
newStream.Write (byte1, 0, byte1.Length)
newStream.Close ()
End Function

Private Function BuildRequestStr ing(ByVal RequestParamete rs
As Parameters, ByVal intType As Integer, ByVal strBoundary As
String)
BuildRequestStr ing = ""

Select Case intType
Case encURL
For Each p As Parameter In RequestParamete rs
BuildRequestStr ing &= p.Name.Trim & "=" &
p.Value.Trim & "&"
Next

BuildRequestStr ing = Mid(BuildReques tString, 1,
Len(BuildReques tString) - 1)
Case encMulti

'the requeststring generated for the multipart form is
'shown below

For Each p As Parameter In RequestParamete rs
BuildRequestStr ing &= "--" & strBoundary &
vbCrLf & "Content-Disposition: form-data; name=""" & p.Name.Trim
& """"
Select Case p.Type
Case Parameter.File
BuildRequestStr ing &= ";
filename=""""" & vbCrLf & "Content-Type: application/octet-
stream" & vbCrLf & vbCrLf & vbCrLf
Case Parameter.Input
BuildRequestStr ing &= vbCrLf & vbCrLf
& p.Value & vbCrLf
End Select
Next
BuildRequestStr ing &= "--" & strBoundary & "--"
End Select
End Function

Private Function CreateRequest(B yVal strURL As String) As
HttpWebRequest
Dim Uri As Uri

Uri = New Uri(strURL)
CreateRequest = HttpWebRequest. Create(Uri)
CreateRequest.A llowAutoRedirec t = True
CreateRequest.C ookieContainer = New CookieContainer

If cc.Count > 0 Then
CreateRequest.C ookieContainer. Add(cc)
End If
End Function

Private Sub GetResponse(ByV al ReadRequest As HttpWebRequest)
Dim HWResponse As HttpWebResponse
Dim cookie As Cookie

HWResponse = ReadRequest.Get Response()

If HWResponse.Cook ies.Count > 0 Then
For Each cookie In HWResponse.Cook ies
cc.Add(cookie)
Next
End If

'debugging
Dim sr As System.IO.Strea mReader
Dim strResult As String

sr = New System.IO.Strea mReader
(HWResponse.Get ResponseStream( ))

txtResponse.Tex t = sr.ReadToEnd

sr.Close()
'debugging
End Sub

Private Function ReadResponse(By Val ReadRequest As
HttpWebRequest, ByVal ReadURL As String) As Parameters
Dim HWResponse As HttpWebResponse
Dim cookie As Cookie
Dim sr As System.IO.Strea mReader
Dim strResult As String
Dim intTagPos As Integer
Dim intLength As Integer
Dim intURLPos As Integer
Dim strTag As String
Dim blnFormFound As Boolean
Dim blnMoreForms As Boolean
Dim intPos As Integer
Dim strName As String
Dim strValue As String
Dim ReadParameter As Parameter
Dim intType As Integer
Dim intInputPos As Integer
Dim intTextPos As Integer
Dim intSelectPos As Integer
Dim blnTagFound As Boolean

ReadResponse = New Parameters

'the next line generates the internal server error
HWResponse = ReadRequest.Get Response()

If HWResponse.Cook ies.Count > 0 Then
For Each cookie In HWResponse.Cook ies
cc.Add(cookie)
Next
End If

sr = New System.IO.Strea mReader
(HWResponse.Get ResponseStream( ))

strResult = sr.ReadToEnd

'debugging
txtResponse.Tex t = strResult
'debugging

blnFormFound = False
blnMoreForms = True
intTagPos = 1

While Not blnFormFound And blnMoreForms
intTagPos = InStr(intTagPos , strResult.ToUpp er,
"<FORM", CompareMethod.T ext)

If intTagPos <> 0 Then
intLength = InStr(intTagPos , strResult, ">",
CompareMethod.T ext) - intTagPos
strTag = strResult.Subst ring(intTagPos,
intLength)

intURLPos = InStr(1, strTag.ToUpper,
ReadURL.ToUpper , CompareMethod.T ext)

If intURLPos <> 0 Then
intLength = InStr(intTagPos ,
strResult.ToUpp er, "</FORM>", CompareMethod.T ext) - intTagPos
strResult = strResult.Subst ring(intTagPos,
intLength)
blnFormFound = True
Else
intTagPos += 1
End If
Else
blnMoreForms = False
End If
End While

If blnFormFound Then
intTagPos = 1

While intTagPos <> 0
intInputPos = InStr(intTagPos , strResult.ToUpp er,
"<INPUT", CompareMethod.T ext)
intTextPos = InStr(intTagPos , strResult.ToUpp er,
"<TEXTAREA" , CompareMethod.T ext)
intSelectPos = InStr(intTagPos ,
strResult.ToUpp er, "<SELECT", CompareMethod.T ext)

intTagPos = IIf(intTextPos <> 0 And intTextPos <
intInputPos, intTextPos, intInputPos)
intTagPos = IIf(intSelectPo s <> 0 And
intSelectPos < intTagPos, intSelectPos, intTagPos)

intType = Parameter.Input

If intTagPos <> 0 Then
intLength = InStr(intTagPos , strResult, ">",
CompareMethod.T ext) - intTagPos
strTag = strResult.Subst ring(intTagPos,
intLength)

intPos = InStr(1, strTag.ToUpper,
"TYPE=SUBMI T", CompareMethod.T ext)
If intPos = 0 Then
intPos = InStr(1, strTag.ToUpper,
"TYPE=""SUBMIT" "", CompareMethod.T ext)
End If

If intPos = 0 Then
intPos = InStr(1, strTag.ToUpper,
"NAME=""", CompareMethod.T ext)

If intPos = 0 Then
intPos = InStr(1, strTag.ToUpper,
"NAME=", CompareMethod.T ext)
intLength = InStr(intPos + 5, strTag,
" ", CompareMethod.T ext) - intPos - 5
strName = strTag.Substrin g(intPos +
4, intLength)
Else
intLength = InStr(intPos + 6, strTag,
"""", CompareMethod.T ext) - intPos - 6
strName = strTag.Substrin g(intPos +
5, intLength)
End If

If intPos <> 0 Then
intPos = InStr(1, strTag.ToUpper,
"VALUE=""", CompareMethod.T ext)

If intPos = 0 Then
strValue = ""
Else
intLength = InStr(intPos + 7,
strTag, """", CompareMethod.T ext) - intPos - 7
strValue = strTag.Substrin g
(intPos + 6, intLength)
End If

intPos = InStr(1, strTag.ToUpper,
"TYPE=""FILE""" , CompareMethod.T ext)

If intPos = 0 Then
intPos = InStr(1, strTag.ToUpper,
"TYPE=FILE" , CompareMethod.T ext)
End If

intType = IIf(intPos = 0, intType,
Parameter.File)

ReadParameter = New Parameter
ReadParameter.N ame = strName
ReadParameter.V alue = strValue
ReadParameter.T ype = intType
ReadResponse.Ad d(ReadParameter )
End If
End If

intTagPos += 1
End If
End While
Else
Throw New System.Exceptio n("Form not found.")
End If
End Function
End Class

Public Class Parameters
Inherits System.Collecti ons.CollectionB ase

Public Sub Add(ByVal sFld As Parameter)
List.Add(sFld)
End Sub

Public ReadOnly Property Item(ByVal index As Integer) As
Parameter
Get
Return CType(List.Item (index), Parameter)
End Get
End Property
End Class

Public Class Parameter
Public Const Input As Integer = 0
Public Const File As Integer = 1

Dim strName As String
Dim strValue As String
Dim intType As Integer

Public Property Name() As String
Get
Return strName
End Get
Set(ByVal vName As String)
strName = vName
End Set
End Property

Public Property Value() As String
Get
Return strValue
End Get
Set(ByVal vName As String)
strValue = vName
End Set
End Property

Public Property Type() As Integer
Get
Return intType
End Get
Set(ByVal vType As Integer)
intType = vType
End Set
End Property
End Class

Public Class Conditions
Private strName As String
Private strID As String

Public Sub New()
strName = ""
strID = ""
End Sub

Public Sub New(ByVal Name As String, ByVal ID As String)
strName = Name
strID = ID
End Sub

Public Property Name() As String
Get
Return strName
End Get

Set(ByVal sValue As String)
strName = sValue
End Set
End Property

Public Property ItemData() As String
Get
Return strID
End Get

Set(ByVal iValue As String)
strID = iValue
End Set
End Property

Public Overrides Function ToString() As String
Return strName
End Function
End Class
- End Code -----------------------------------------------------

Here's the requeststring generated for the multipart form:

- Start requeststring ------------------------------------------
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="condition "

830
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="notes"

good good
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="image_fil e"; filename=""
Content-Type: application/octet-stream

-----------------------------7d4285126106b0
Content-Disposition: form-data; name="image_url "

-----------------------------7d4285126106b0
Content-Disposition: form-data; name="version"

729
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="domain_id "

1856
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="meta_id"

1
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="context_n ame"

w13.1097912464. 0000318444
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="x"

20
-----------------------------7d4285126106b0
Content-Disposition: form-data; name="y"

20
-----------------------------7d4285126106b0--
- End requeststring --------------------------------------------

The requeststring looks right to me. I'm wondering if there's a
header I should set that I'm missing.

Thanks for the help.

--
Greg
----
greg -at- spencersoft -dot- com

**Nick Malik** · Nov 21 '05, 04:29 AM

Re: Using Httpwebrequest to Submit multipart/form-data

That got right down to the details, didn't it?

I take it that, even though this thread is not new, you have not solved the
problem yet.

You look like you are doing things fairly well. You are collecting the
cookies and passing them back, and the formatting looks pretty good. I
would suggest, however, that the page that fails is calling a JSP, which
means that the server side may have a good deal of logic to PREVENT folks
like you from pretending to be a browser.

I don't see that you have set the User Agent header. It is probably normal
for the JSP page to be attempting to identify the browser, perhaps to send
back a message that will render correctly every time. I've done similar
code (a little differently, but same concept) and I've had problems when I
didn't set the User Agent header. That's where I would start.

If that doesn't work, there may be some software that you can install that
will sniff your own port 80, showing you what packets are travelling. You
can then access the pages using IE and then using your app, to see if there
is another header, perhaps one added by some Javascript code that downloaded
on the previous page, that you are not sending. I know that there is a tool
for doing this that is downloadable open source using the Unix compatibility
libraries (I used it about 18 months ago... don't remember the name but I'm
sure I can find it, so if you can't, let me know and I will dig a little).

Good luck
--- Nick Malik

http://weblogs.asp.net/nickmalik

"Gregory A Greenman" <see@sig.belo w> wrote in message
news:MPG.1bda99 d64f5012309896c 9@netnews.comca st.net...[color=blue]
> In article <uD7ib88rEHA.16 44@tk2msftngp13 .phx.gbl>,
> joerg.jooss@gmx .net says...[color=green]
> > Gregory A Greenman wrote:[color=darkred]
> > > I'm trying to write a program in vb.net to automate filling out a
> > > series of forms on a website. There are three forms I need to
> > > fill out in sequence. The first one is urlencoded. My program is
> > > able to fill that one out just fine.
> > >
> > > The second form is multipart/form-data. Unfortunately, I haven't
> > > been able to fill that out in a way that makes the server happy.
> > >
> > > I set up a copy of this form at my web site so that I could see
> > > exactly what a browser sends to the server and compare that to
> > > what my program sends. I saw a few mistakes in my program and I
> > > fixed them, but the real web site still rejects my program's
> > > submissions.
> > >
> > > As best I can tell, the contents that my program submits are
> > > identical to the contents submitted by a browser. Is there
> > > anything else that might be causing my problem?[/color]
> >
> > Well, analyzing your problem from 10000' isn't that easy... can you[/color][/color]
provide[color=blue][color=green]
> > more details (code, error messages, ...)?[/color]
>
>
>
> Okay. I'm getting "The remote server returned an error: (500)
> internal server error".
>
> I've got a form with two text boxes in the upper left corner,
> txtHalfID and txtHalfPassword . There are three text boxes in the
> upper right corner, txtISBN, txtDescription and txtPrice. There's
> also a drop down combo in the upper right, cmbCondition.
>
> The bottom portion of the screen has a read only multi line text
> box called txtResponse, where the raw HTML from the server is
> displayed.
>
> Below the left text boxes is a button, btnSignOn. If you click
> that button, it will sign you onto Half.com using the ID and
> password in the textboxes above it. This part works fine for me.
> I can see the "Welcome to eBay" page in txtResponse.
>
> Below the right boxes is a button called btnListBook. When I
> click on it it should call four web pages on half.com in order.
>
> First it calls http://half.ebay.com/help/sell_books.cfm. It fills
> in the field in the form there with txtISBN.
>
> Next it calls http://half.ebay.com/cat/sell/pmsearch.cgi. It
> fills out the form there with txtDescription and cmbCondition.
> This form allows file uploads, so it's a multipart form. Although
> my program's output looks good to me, I get that server error
> when I submit this form.
>
> Here's the code:
>
> - Start Code ---------------------------------------------------
> Imports System.Net
>
> Public Class SBM
> Inherits System.Windows. Forms.Form
>
> Dim cc As New CookieCollectio n
> Const encURL As Integer = 0
> Const encMulti As Integer = 1
>
> Private Sub SBM_Load(ByVal sender As System.Object, ByVal e
> As System.EventArg s) Handles MyBase.Load
> txtHalfID.Text = ""
> txtHalfPassword .Text = ""
>
> txtISBN.Text = "0764560255 "
> txtDescription. Text = "good good"
> txtPrice.Text = "99.99"
>
> With cmbCondition
> .Items.Add(New Conditions("Bra nd New", "830"))
> .Items.Add(New Conditions("Lik e New", "840"))
> .Items.Add(New Conditions("Ver y Good", "849"))
> .Items.Add(New Conditions("Goo d", "859"))
> .Items.Add(New Conditions("Acc eptable", "864"))
> .SelectedIndex = 0
> End With
>
> cmbCondition.Se lectedIndex = 0
> End Sub
>
> Private Sub btnSignOn_Click (ByVal sender As System.Object,
> ByVal e As System.EventArg s) Handles btnSignOn.Click
> Dim HWRequest As HttpWebRequest
> Dim strURL As String
> Dim HWParameters As Parameters
> Dim intFound As Integer
>
> HWRequest = GetRequest
> ("https://signin.ebay.com/ws/eBayISAPI.dll?S ignIn&UsingSSL= 1
> &co_partnerid=2 &siteid=20")
> strURL = "https://signin.half.eba y.com/ws/eBayISAPI.dll"
>
> HWParameters = ReadResponse(HW Request, strURL)
>
> intFound = 0
>
> For Each p As Parameter In HWParameters
> Select Case p.Name
> Case "userid"
> p.Value = txtHalfID.Text
> intFound += 1
> Case "pass"
> p.Value = txtHalfPassword .Text
> intFound += 1
> End Select
>
> If intFound = 2 Then
> Exit For
> End If
> Next
>
> HWRequest = PostRequest(str URL, HWParameters, encURL)
> GetResponse(HWR equest)
> End Sub
>
> Private Sub btnListBook_Cli ck(ByVal sender As System.Object,
> ByVal e As System.EventArg s) Handles btnListBook.Cli ck
> Dim strPostData As String
> Dim HWRequest As HttpWebRequest
> Dim strURL As String
> Dim HWParameters As Parameters
> Dim intFound As Integer
> Dim pr As Parameter
>
> Try
> HWRequest = GetRequest
> ("http://half.ebay.com/help/sell_books.cfm" )
> strURL = "http://half.ebay.com/cat/sell/pmsearch.cgi"
>
> HWParameters = ReadResponse(HW Request, strURL)
>
> intFound = 0
>
> For Each p As Parameter In HWParameters
> Select Case p.Name
> Case "p_code"
> p.Value = txtISBN.Text
> intFound += 1
> End Select
>
> If intFound = 1 Then
> Exit For
> End If
> Next
>
> HWRequest = PostRequest(str URL, HWParameters, encURL)
>
> strURL = "/cat/sell/save_new_listin g.cgi"
>
> HWParameters = ReadResponse(HW Request, strURL)
> pr = New Parameter
> pr.Name = "x"
> pr.Value = 20
> pr.Type = Parameter.Input
> HWParameters.Ad d(pr)
> pr = New Parameter
> pr.Name = "y"
> pr.Value = 20
> pr.Type = Parameter.Input
> HWParameters.Ad d(pr)
> intFound = 0
>
> For Each p As Parameter In HWParameters
> Select Case p.Name
> Case "notes"
> p.Value = txtDescription. Text
> intFound += 1
> Case "condition"
> p.Value = cmbCondition.It ems
> (cmbCondition.S electedIndex).I temData
> intFound += 1
> End Select
>
> If intFound = 2 Then
> Exit For
> End If
> Next
>
> strURL =
> "http://half.ebay.com/cat/sell/save_new_listin g.cgi"
>
> HWRequest = PostRequest(str URL, HWParameters,
> encMulti)
>
> strURL = "sell.jsp"
> HWRequest.Refer er =
> "http://half.ebay.com/cat/sell/pmsearch.cgi"
>
>
> 'the internal server error is generated in this call
> 'to ReadResponse
> HWParameters = ReadResponse(HW Request, strURL)
> intFound = 0
>
> For Each p As Parameter In HWParameters
> Select Case p.Name
> Case "itemPrice"
> p.Value = txtPrice.Text
> intFound += 1
> End Select
>
> If intFound = 1 Then
> Exit For
> End If
> Next
>
> strURL = "http://half.ebay.com/cat/sell/sell.jsp"
>
> HWRequest = PostRequest(str URL, HWParameters, encURL)
>
> GetResponse(HWR equest)
>
> MessageBox.Show ("Success!", MsgBoxStyle.OKO nly, "Book
> Posted")
>
> Catch ex As Exception
> MessageBox.Show ("Error: " & ex.Message, "Error!!!",
> MessageBoxButto ns.OK, MessageBoxIcon. Exclamation)
>
> MsgBox("Half.co m appears to have changed its posting
> procedures. As a result, this version of SBM cannot list books on
> it.", MsgBoxStyle.Exc lamation, "Half.com Listing Problem")
> End Try
> End Sub
>
> Private Function GetRequest(ByVa l strURL As String) As
> HttpWebRequest
> GetRequest = CreateRequest(s trURL)
> GetRequest.Meth od = "GET"
> End Function
>
> Private Function PostRequest(ByV al strURL As String, ByVal
> PostParameters As Parameters, ByVal intType As Integer) As
> HttpWebRequest
> Dim encoding As New System.Text.ASC IIEncoding
> Dim byte1 As Byte()
> Dim newStream As System.IO.Strea m
> Dim strData As String
> Const strBoundary As String =
> "---------------------------7d4285126106b0"
>
> PostRequest = CreateRequest(s trURL)
> PostRequest.Met hod = "POST"
>
> If intType = encURL Then
> PostRequest.Con tentType = "applicatio n/x-www-form-
> urlencoded"
> Else
> PostRequest.Con tentType = "multipart/form-data,
> boundary=" & strBoundary
> End If
>
> strData = BuildRequestStr ing(PostParamet ers, intType,
> strBoundary)
>
> PostRequest.Con tentLength = strData.Length
>
> byte1 = encoding.GetByt es(strData)
>
> newStream = PostRequest.Get RequestStream
> newStream.Write (byte1, 0, byte1.Length)
> newStream.Close ()
> End Function
>
> Private Function BuildRequestStr ing(ByVal RequestParamete rs
> As Parameters, ByVal intType As Integer, ByVal strBoundary As
> String)
> BuildRequestStr ing = ""
>
> Select Case intType
> Case encURL
> For Each p As Parameter In RequestParamete rs
> BuildRequestStr ing &= p.Name.Trim & "=" &
> p.Value.Trim & "&"
> Next
>
> BuildRequestStr ing = Mid(BuildReques tString, 1,
> Len(BuildReques tString) - 1)
> Case encMulti
>
>
> 'the requeststring generated for the multipart form is
> 'shown below
>
>
> For Each p As Parameter In RequestParamete rs
> BuildRequestStr ing &= "--" & strBoundary &
> vbCrLf & "Content-Disposition: form-data; name=""" & p.Name.Trim
> & """"
> Select Case p.Type
> Case Parameter.File
> BuildRequestStr ing &= ";
> filename=""""" & vbCrLf & "Content-Type: application/octet-
> stream" & vbCrLf & vbCrLf & vbCrLf
> Case Parameter.Input
> BuildRequestStr ing &= vbCrLf & vbCrLf
> & p.Value & vbCrLf
> End Select
> Next
> BuildRequestStr ing &= "--" & strBoundary & "--"
> End Select
> End Function
>
> Private Function CreateRequest(B yVal strURL As String) As
> HttpWebRequest
> Dim Uri As Uri
>
> Uri = New Uri(strURL)
> CreateRequest = HttpWebRequest. Create(Uri)
> CreateRequest.A llowAutoRedirec t = True
> CreateRequest.C ookieContainer = New CookieContainer
>
> If cc.Count > 0 Then
> CreateRequest.C ookieContainer. Add(cc)
> End If
> End Function
>
> Private Sub GetResponse(ByV al ReadRequest As HttpWebRequest)
> Dim HWResponse As HttpWebResponse
> Dim cookie As Cookie
>
> HWResponse = ReadRequest.Get Response()
>
> If HWResponse.Cook ies.Count > 0 Then
> For Each cookie In HWResponse.Cook ies
> cc.Add(cookie)
> Next
> End If
>
> 'debugging
> Dim sr As System.IO.Strea mReader
> Dim strResult As String
>
> sr = New System.IO.Strea mReader
> (HWResponse.Get ResponseStream( ))
>
> txtResponse.Tex t = sr.ReadToEnd
>
> sr.Close()
> 'debugging
> End Sub
>
> Private Function ReadResponse(By Val ReadRequest As
> HttpWebRequest, ByVal ReadURL As String) As Parameters
> Dim HWResponse As HttpWebResponse
> Dim cookie As Cookie
> Dim sr As System.IO.Strea mReader
> Dim strResult As String
> Dim intTagPos As Integer
> Dim intLength As Integer
> Dim intURLPos As Integer
> Dim strTag As String
> Dim blnFormFound As Boolean
> Dim blnMoreForms As Boolean
> Dim intPos As Integer
> Dim strName As String
> Dim strValue As String
> Dim ReadParameter As Parameter
> Dim intType As Integer
> Dim intInputPos As Integer
> Dim intTextPos As Integer
> Dim intSelectPos As Integer
> Dim blnTagFound As Boolean
>
> ReadResponse = New Parameters
>
>
> 'the next line generates the internal server error
> HWResponse = ReadRequest.Get Response()
>
> If HWResponse.Cook ies.Count > 0 Then
> For Each cookie In HWResponse.Cook ies
> cc.Add(cookie)
> Next
> End If
>
> sr = New System.IO.Strea mReader
> (HWResponse.Get ResponseStream( ))
>
> strResult = sr.ReadToEnd
>
> 'debugging
> txtResponse.Tex t = strResult
> 'debugging
>
> blnFormFound = False
> blnMoreForms = True
> intTagPos = 1
>
> While Not blnFormFound And blnMoreForms
> intTagPos = InStr(intTagPos , strResult.ToUpp er,
> "<FORM", CompareMethod.T ext)
>
> If intTagPos <> 0 Then
> intLength = InStr(intTagPos , strResult, ">",
> CompareMethod.T ext) - intTagPos
> strTag = strResult.Subst ring(intTagPos,
> intLength)
>
> intURLPos = InStr(1, strTag.ToUpper,
> ReadURL.ToUpper , CompareMethod.T ext)
>
> If intURLPos <> 0 Then
> intLength = InStr(intTagPos ,
> strResult.ToUpp er, "</FORM>", CompareMethod.T ext) - intTagPos
> strResult = strResult.Subst ring(intTagPos,
> intLength)
> blnFormFound = True
> Else
> intTagPos += 1
> End If
> Else
> blnMoreForms = False
> End If
> End While
>
> If blnFormFound Then
> intTagPos = 1
>
> While intTagPos <> 0
> intInputPos = InStr(intTagPos , strResult.ToUpp er,
> "<INPUT", CompareMethod.T ext)
> intTextPos = InStr(intTagPos , strResult.ToUpp er,
> "<TEXTAREA" , CompareMethod.T ext)
> intSelectPos = InStr(intTagPos ,
> strResult.ToUpp er, "<SELECT", CompareMethod.T ext)
>
> intTagPos = IIf(intTextPos <> 0 And intTextPos <
> intInputPos, intTextPos, intInputPos)
> intTagPos = IIf(intSelectPo s <> 0 And
> intSelectPos < intTagPos, intSelectPos, intTagPos)
>
> intType = Parameter.Input
>
> If intTagPos <> 0 Then
> intLength = InStr(intTagPos , strResult, ">",
> CompareMethod.T ext) - intTagPos
> strTag = strResult.Subst ring(intTagPos,
> intLength)
>
> intPos = InStr(1, strTag.ToUpper,
> "TYPE=SUBMI T", CompareMethod.T ext)
> If intPos = 0 Then
> intPos = InStr(1, strTag.ToUpper,
> "TYPE=""SUBMIT" "", CompareMethod.T ext)
> End If
>
> If intPos = 0 Then
> intPos = InStr(1, strTag.ToUpper,
> "NAME=""", CompareMethod.T ext)
>
> If intPos = 0 Then
> intPos = InStr(1, strTag.ToUpper,
> "NAME=", CompareMethod.T ext)
> intLength = InStr(intPos + 5, strTag,
> " ", CompareMethod.T ext) - intPos - 5
> strName = strTag.Substrin g(intPos +
> 4, intLength)
> Else
> intLength = InStr(intPos + 6, strTag,
> """", CompareMethod.T ext) - intPos - 6
> strName = strTag.Substrin g(intPos +
> 5, intLength)
> End If
>
> If intPos <> 0 Then
> intPos = InStr(1, strTag.ToUpper,
> "VALUE=""", CompareMethod.T ext)
>
> If intPos = 0 Then
> strValue = ""
> Else
> intLength = InStr(intPos + 7,
> strTag, """", CompareMethod.T ext) - intPos - 7
> strValue = strTag.Substrin g
> (intPos + 6, intLength)
> End If
>
> intPos = InStr(1, strTag.ToUpper,
> "TYPE=""FILE""" , CompareMethod.T ext)
>
> If intPos = 0 Then
> intPos = InStr(1, strTag.ToUpper,
> "TYPE=FILE" , CompareMethod.T ext)
> End If
>
> intType = IIf(intPos = 0, intType,
> Parameter.File)
>
> ReadParameter = New Parameter
> ReadParameter.N ame = strName
> ReadParameter.V alue = strValue
> ReadParameter.T ype = intType
> ReadResponse.Ad d(ReadParameter )
> End If
> End If
>
> intTagPos += 1
> End If
> End While
> Else
> Throw New System.Exceptio n("Form not found.")
> End If
> End Function
> End Class
>
> Public Class Parameters
> Inherits System.Collecti ons.CollectionB ase
>
> Public Sub Add(ByVal sFld As Parameter)
> List.Add(sFld)
> End Sub
>
> Public ReadOnly Property Item(ByVal index As Integer) As
> Parameter
> Get
> Return CType(List.Item (index), Parameter)
> End Get
> End Property
> End Class
>
>
>
>
> Public Class Parameter
> Public Const Input As Integer = 0
> Public Const File As Integer = 1
>
> Dim strName As String
> Dim strValue As String
> Dim intType As Integer
>
> Public Property Name() As String
> Get
> Return strName
> End Get
> Set(ByVal vName As String)
> strName = vName
> End Set
> End Property
>
> Public Property Value() As String
> Get
> Return strValue
> End Get
> Set(ByVal vName As String)
> strValue = vName
> End Set
> End Property
>
> Public Property Type() As Integer
> Get
> Return intType
> End Get
> Set(ByVal vType As Integer)
> intType = vType
> End Set
> End Property
> End Class
>
>
> Public Class Conditions
> Private strName As String
> Private strID As String
>
> Public Sub New()
> strName = ""
> strID = ""
> End Sub
>
> Public Sub New(ByVal Name As String, ByVal ID As String)
> strName = Name
> strID = ID
> End Sub
>
> Public Property Name() As String
> Get
> Return strName
> End Get
>
> Set(ByVal sValue As String)
> strName = sValue
> End Set
> End Property
>
> Public Property ItemData() As String
> Get
> Return strID
> End Get
>
> Set(ByVal iValue As String)
> strID = iValue
> End Set
> End Property
>
> Public Overrides Function ToString() As String
> Return strName
> End Function
> End Class
> - End Code -----------------------------------------------------
>
>
> Here's the requeststring generated for the multipart form:
>
> - Start requeststring ------------------------------------------
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="condition "
>
> 830
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="notes"
>
> good good
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="image_fil e"; filename=""
> Content-Type: application/octet-stream
>
>
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="image_url "
>
>
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="version"
>
> 729
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="domain_id "
>
> 1856
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="meta_id"
>
> 1
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="context_n ame"
>
> w13.1097912464. 0000318444
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="x"
>
> 20
> -----------------------------7d4285126106b0
> Content-Disposition: form-data; name="y"
>
> 20
> -----------------------------7d4285126106b0--
> - End requeststring --------------------------------------------
>
> The requeststring looks right to me. I'm wondering if there's a
> header I should set that I'm missing.
>
> Thanks for the help.
>
>
>
>
> --
> Greg
> ----
> greg -at- spencersoft -dot- com[/color]

**Gregory A Greenman** · Nov 21 '05, 04:29 AM

Re: Using Httpwebrequest to Submit multipart/form-data

In article <HAdcd.482227$8 _6.62731@attbi_ s04>,
nickmalik@hotma il.nospam.com says...[color=blue]
> That got right down to the details, didn't it?
>
> I take it that, even though this thread is not new, you have not solved the
> problem yet.[/color]

Nope, I had an important meeting out of town I had to prepare
for, plus I wanted to make my code more presentable before I
posted it.

[color=blue]
> You look like you are doing things fairly well. You are collecting the
> cookies and passing them back, and the formatting looks pretty good. I
> would suggest, however, that the page that fails is calling a JSP, which
> means that the server side may have a good deal of logic to PREVENT folks
> like you from pretending to be a browser.[/color]

Here's the form tag for the three pages I'm trying to access. The
problem I was having was with the second form. It looks like the
third one uses Java, so that may be a problem there.

<FORM action="http://half.ebay.com/cat/sell/pmsearch.cgi"
method="post">

<form action="/cat/sell/save_new_listin g.cgi"
enctype="multip art/form-data" method=post>

<form name="pricing" method="post" action="sell.js p" onSubmit="if
(this.submitted ) return false; else { this.submitted = true;
disableSubmits( this); return true; }">

[color=blue]
> I don't see that you have set the User Agent header. It is probably normal
> for the JSP page to be attempting to identify the browser, perhaps to send
> back a message that will render correctly every time. I've done similar
> code (a little differently, but same concept) and I've had problems when I
> didn't set the User Agent header. That's where I would start.[/color]

That seems to have solved the problem, at least for this step. I
added this line:

HWRequest.UserA gent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows
NT 5.1; SV1; .NET CLR 1.1.4322)"

and I was able to get past the problem. I did get a 404 error, so
I'm not all the way home yet, but I'm one step closer. Also, the
404 error came later than the 505 I was getting previously.

I'm about to head out the door, so I'll see if I can make any
more progress later tonight.

[color=blue]
> If that doesn't work, there may be some software that you can install that
> will sniff your own port 80, showing you what packets are travelling. You
> can then access the pages using IE and then using your app, to see if there
> is another header, perhaps one added by some Javascript code that downloaded
> on the previous page, that you are not sending. I know that there is a tool
> for doing this that is downloadable open source using the Unix compatibility
> libraries (I used it about 18 months ago... don't remember the name but I'm
> sure I can find it, so if you can't, let me know and I will dig a little).[/color]

I found this: tcptrace http://www.tcptrace.com/. Hopefully I'll
be able to cross this next hurdle without it.

Thanks for the help,

Greg

**Joerg Jooss** · Nov 21 '05, 04:30 AM

Re: Using Httpwebrequest to Submit multipart/form-data

Gregory A Greenman wrote:[color=blue]
> In article <HAdcd.482227$8 _6.62731@attbi_ s04>,
> nickmalik@hotma il.nospam.com says...[/color]

I think the way you handle upload files may be the culprit. You're uploading
files (or rather pretend to) exclusively as application/octet-stream. From a
web application perspective, application/octet-stream is rather
unspecific -- I cannot imagine what a web application could do with some
unspecific binary content (other than archive it in some way).

As far useful tools are concerned, I strongly suggest using Fiddler
(http://www.fiddlertool.com/). It's a debugging proxy that runs locally and
can track all HTTP traffic between your application and the remote host.

Cheers,

--
Joerg Jooss

Something With Code, Cloud and AI

https://www.joergjooss.de

news@joergjooss .de

**Gregory A Greenman** · Nov 21 '05, 04:30 AM

Re: Using Httpwebrequest to Submit multipart/form-data

In article <u$qazGDtEHA.32 00@TK2MSFTNGP09 .phx.gbl>,
joerg.jooss@gmx .net says...[color=blue]
> Gregory A Greenman wrote:[color=green]
> > In article <HAdcd.482227$8 _6.62731@attbi_ s04>,
> > nickmalik@hotma il.nospam.com says...[/color]
>
> I think the way you handle upload files may be the culprit. You're uploading
> files (or rather pretend to) exclusively as application/octet-stream. From a
> web application perspective, application/octet-stream is rather
> unspecific -- I cannot imagine what a web application could do with some
> unspecific binary content (other than archive it in some way).[/color]

I had set up a mock version of that form on my web site. When the
button was clicked on that form, the cgi would just record what
the browser sent. I copied that into my program. Both IE and
Mozilla Firefox used application/octet-stream when there was no
actual upload.

I was finally able to get past that page by adding the following
line to my code:

HWRequest.UserA gent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows
NT 5.1; SV1; .NET CLR 1.1.4322)"

Stripping it of all extraneous HTML, the form that I was trying
to fill out is:

<form action="/cat/sell/save_new_listin g.cgi"
enctype="multip art/form-data" method=post>
<select name=condition SELECTED>
<option value=''>Select One
<option value=830 >Brand New
<option value=840 >Like New
<option value=849 >Very Good
<option value=859 >Good
<option value=864 >Acceptable
</select>
<textarea name="notes" rows=5 cols=40></textarea>
<INPUT TYPE=FILE NAME="image_fil e">
<INPUT TYPE=TEXT NAME="image_url " VALUE=>
<input type=submit name="Continue" value="Continue >" border=
0>
<input type=hidden name="version" value="729">
<input type=hidden name="domain_id " value="1856">
<input type=hidden name="meta_id" value="1">
<input type=hidden name="context_n ame"
value="w48.1097 876311.00002236 4">
</form>

I noticed that when IE filled out the form, it put the "x" and
"y" parameters at the end, after all the hidden parameters. OTOH,
Mozilla Firefox placed "x" and "y" where the button is, before
the hidden parameters. Maybe that's why that page needs to know
what the browser is when the others didn't.

[color=blue]
> As far useful tools are concerned, I strongly suggest using Fiddler
> (http://www.fiddlertool.com/). It's a debugging proxy that runs locally and
> can track all HTTP traffic between your application and the remote host.[/color]

Thanks, I'm now having a problem filling out the next (and last)
form in the sequence. I may take a look at that, if I can't
figure out the solution otherwise.

Thanks for the help.

--
Greg
----
greg -at- spencersoft -dot- com

**Joerg Jooss** · Nov 21 '05, 04:30 AM

Re: Using Httpwebrequest to Submit multipart/form-data

Gregory A Greenman wrote:[color=blue]
> I had set up a mock version of that form on my web site. When the
> button was clicked on that form, the cgi would just record what
> the browser sent. I copied that into my program. Both IE and
> Mozilla Firefox used application/octet-stream when there was no
> actual upload.[/color]

That's because you probably tried to upload some arbitrary binary. Both
browsers use proper the MIME type for file uploads if possible.
[color=blue]
> I noticed that when IE filled out the form, it put the "x" and
> "y" parameters at the end, after all the hidden parameters. OTOH,
> Mozilla Firefox placed "x" and "y" where the button is, before
> the hidden parameters. Maybe that's why that page needs to know
> what the browser is when the others didn't.[/color]

There's no defined order in which form parameters are to be sent, so that
shouldn't make a difference. If a web application does assume a specific
order, it's broken.

Cheers,

--
Joerg Jooss

Something With Code, Cloud and AI

https://www.joergjooss.de

news@joergjooss .de

**Gregory A Greenman** · Nov 21 '05, 04:30 AM

Re: Using Httpwebrequest to Submit multipart/form-data

In article <#XBzNBGtEHA.13 36@tk2msftngp13 .phx.gbl>,
joerg.jooss@gmx .net says...[color=blue]
> Gregory A Greenman wrote:[color=green]
> > I had set up a mock version of that form on my web site. When the
> > button was clicked on that form, the cgi would just record what
> > the browser sent. I copied that into my program. Both IE and
> > Mozilla Firefox used application/octet-stream when there was no
> > actual upload.[/color]
>
> That's because you probably tried to upload some arbitrary binary. Both
> browsers use proper the MIME type for file uploads if possible.[/color]

No, I've never tried to do an upload with this form. Apparently,
if there's no upload, IE and FF both use application/octet-stream
with no data.

[color=blue][color=green]
> > I noticed that when IE filled out the form, it put the "x" and
> > "y" parameters at the end, after all the hidden parameters. OTOH,
> > Mozilla Firefox placed "x" and "y" where the button is, before
> > the hidden parameters. Maybe that's why that page needs to know
> > what the browser is when the others didn't.[/color]
>
> There's no defined order in which form parameters are to be sent, so that
> shouldn't make a difference. If a web application does assume a specific
> order, it's broken.[/color]

I can't seem to find any equivalent for multipart forms, but
according to RFC 1866 browsers should list the parameters in the
same order they appear in in the form.

8.2.1.2:
"The fields are listed in the order they appear in the document
with the name separated from the value by `=' and the pairs
separated from each other by `&'. Fields with null values may be
omitted."

RFC 1866 - Hypertext Markup Language - 2.0 (RFC1866)

http://www.faqs.org/rfcs/rfc1866.html

RFC 1866 - Hypertext Markup Language - 2.0

In an early pass, I wasn't preserving the field order. For the
multipart form, half was complaining that I hadn't sent it the
condition parameter. So, I think the order matters for this.

Thanks for the help.

--
Greg
----
greg -at- spencersoft -dot- com

**Joerg Jooss** · Nov 21 '05, 04:46 AM

Re: Using Httpwebrequest to Submit multipart/form-data

Gregory A Greenman wrote:[color=blue]
> In article <#XBzNBGtEHA.13 36@tk2msftngp13 .phx.gbl>,
> joerg.jooss@gmx .net says...[/color]
[...][color=blue][color=green]
>> There's no defined order in which form parameters are to be sent, so
>> that shouldn't make a difference. If a web application does assume a
>> specific order, it's broken.[/color]
>
>
> I can't seem to find any equivalent for multipart forms, but
> according to RFC 1866 browsers should list the parameters in the
> same order they appear in in the form.
>
> 8.2.1.2:
> "The fields are listed in the order they appear in the document
> with the name separated from the value by `=' and the pairs
> separated from each other by `&'. Fields with null values may be
> omitted."
>
> http://www.faqs.org/rfcs/rfc1866.html[/color]

You're right! I was stuck in my own little word of
application/x-www-form-urlencoded ;-)

That's what happnes once you got used not to rely on parameter ordering due
to the way the Servlet API or ASP.NET work...

Cheers,

--
Joerg Jooss

Something With Code, Cloud and AI

https://www.joergjooss.de

news@joergjooss .de

Using Httpwebrequest to Submit multipart/form-data

Using Httpwebrequest to Submit multipart/form-data

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