Request.ServerVariables Question

[W. Loo]

Hi,

I've got a question regarding the usage of Request.ServerV ariables.
I'm not sure this is really a ASP question, so redirects to a more
appropriate newsgroup are welcome.

I have a variable that is being passed to me through HTTP headers
called "Test." I am able to see this variable and its value when I use
Request.ServerV ariables("ALL_H TTP"). Additionally, when I iterate
through Request.ServerV ariables using a "For Each key in
Request.ServerV ariables" the key of "Test" comes up. However, when I
use Request.ServerV ariables("Test" ), the value returned to me is
always empty. One workaround thats been suggested by the person
sending me the header is to simply parse the contents of "ALL_HTTP" to
retrieve the data I want. This is doable, but I'm curious to know why
exactly the value of Request.ServerV ariables("Test" ) comes up empty
when I can plainly see there is a value in the "ALL_HTTP" dump?

Thanks in advance!

[Aaron Bertrand - MVP]

Re: Request.ServerV ariables Question

The ALL_HTTP info is news to me, but this should answer why there isn't a
custom header:

http://www.aspfaq.com/2261

"W. Loo" <wlo023@hotmail .com> wrote in message
news:33c69d4e.0 311171408.3ac18 c39@posting.goo gle.com...[color=blue]
> Hi,
>
> I've got a question regarding the usage of Request.ServerV ariables.
> I'm not sure this is really a ASP question, so redirects to a more
> appropriate newsgroup are welcome.
>
> I have a variable that is being passed to me through HTTP headers
> called "Test." I am able to see this variable and its value when I use
> Request.ServerV ariables("ALL_H TTP"). Additionally, when I iterate
> through Request.ServerV ariables using a "For Each key in
> Request.ServerV ariables" the key of "Test" comes up. However, when I
> use Request.ServerV ariables("Test" ), the value returned to me is
> always empty. One workaround thats been suggested by the person
> sending me the header is to simply parse the contents of "ALL_HTTP" to
> retrieve the data I want. This is doable, but I'm curious to know why
> exactly the value of Request.ServerV ariables("Test" ) comes up empty
> when I can plainly see there is a value in the "ALL_HTTP" dump?
>
> Thanks in advance![/color]

[Chris Hohmann]

Re: Request.ServerV ariables Question

"W. Loo" <wlo023@hotmail .com> wrote in message
news:33c69d4e.0 311171408.3ac18 c39@posting.goo gle.com...[color=blue]
> Hi,
>
> I've got a question regarding the usage of Request.ServerV ariables.
> I'm not sure this is really a ASP question, so redirects to a more
> appropriate newsgroup are welcome.
>
> I have a variable that is being passed to me through HTTP headers
> called "Test." I am able to see this variable and its value when I use
> Request.ServerV ariables("ALL_H TTP"). Additionally, when I iterate
> through Request.ServerV ariables using a "For Each key in
> Request.ServerV ariables" the key of "Test" comes up. However, when I
> use Request.ServerV ariables("Test" ), the value returned to me is
> always empty. One workaround thats been suggested by the person
> sending me the header is to simply parse the contents of "ALL_HTTP" to
> retrieve the data I want. This is doable, but I'm curious to know why
> exactly the value of Request.ServerV ariables("Test" ) comes up empty
> when I can plainly see there is a value in the "ALL_HTTP" dump?
>
> Thanks in advance![/color]

Any variables not natively enumerated into the ServerVariables
collection should be accessed by prefixing with "HTTP_" or "HEADER_". In
your case:

Request.ServerV ariables("HTTP_ Test")

Here's a link to the documentation for the ServerVariables collection

http://msdn.microsoft.com/library/en-us/iisref/htm/ref_vbom_reqocsv.asp

HTH
-Chris Hohmann