RewritePath in HttpHandler - how to?

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  • Tomasz J
    #1

    RewritePath in HttpHandler - how to?

    Hello Developers,

    I have a following problem: I need to write a HttpHandler rewriting requests
    like:
    /Resource.axd?re sid=1 to /someimage.gif

    My HttpHandler is listed in the web.config, its ProcessRequest( ) method gets
    called but I cannot get it to work.
    If within IHttpHandler.Pr ocessRequest() method instead of RewritePath()
    method I use Server.Transfer () it works in IE but FireFox instead of images
    shows text garbage. I suspect Response.Conten tType is incorrect and FireFox
    is just more sensitive.

    Has anyone managed to handle a similar scenario where not only path gets
    rewritten but also the resource type?
    Why RewritePath() called within IHttpHandler.Pr ocessRequest() does not seem
    to work?

    Thank you for any hints.

    Tomasz

    Tags: None
    • George
      #2
      Re: RewritePath in HttpHandler - how to?

      1. RewritePath is working within .NET Framework.
      Meaning that you can rewrite path to mypage.aspx but not to mygif.gif

      2. You right about Server.Transfer I believe that default ContentType set by
      ASP.NET text/html and cause of that Firefox shows image as text.

      3. Why do you need to rewrite path anyway if you doing images?
      Just use Context.Respons e.WriteFile(..)
      and set ContentType = "image"
      or "image/gif" or "image/jpeg"
      I believe "image" will be sufficient.

      George,

      "Tomasz J" <oegweb@nospam. nospamwrote in message
      news:OFfuvrpHJH A.4816@TK2MSFTN GP06.phx.gbl...
      Hello Developers,
      >
      I have a following problem: I need to write a HttpHandler rewriting
      requests like:
      /Resource.axd?re sid=1 to /someimage.gif
      >
      My HttpHandler is listed in the web.config, its ProcessRequest( ) method
      gets called but I cannot get it to work.
      If within IHttpHandler.Pr ocessRequest() method instead of RewritePath()
      method I use Server.Transfer () it works in IE but FireFox instead of
      images shows text garbage. I suspect Response.Conten tType is incorrect and
      FireFox is just more sensitive.
      >
      Has anyone managed to handle a similar scenario where not only path gets
      rewritten but also the resource type?
      Why RewritePath() called within IHttpHandler.Pr ocessRequest() does not
      seem to work?
      >
      Thank you for any hints.
      >
      Tomasz

        Comment

        • Steven Cheng
          #3
          RE: RewritePath in HttpHandler - how to?

          Hi Tomasz,

          I agree to what George has suggested. For such scenario, since
          Context.Rewrite path will make the request continually be processed by
          ASP.NET runtime. That means rewrite path to a static file type(such as jpg,
          css which is directly configured to be handled by IIS) will not work. My
          suggestion is you create another custom handler(such as a static resource
          handler) which will accept request and write out the certain file
          content(jpg, css ....) according to some parameter(in querystring or
          HttpContext.Ite ms). Thus, your rewrite handler(or module) can rewrite the
          path to that custom handler to emit those certain static resources.

          Here are some articles mentioned how to build a httphandler write out
          custom resource stream(image)

          #Thumbnailer HTTP Handler
          http://www.codeproject.com/KB/web-image/thumbnailer.aspx


          #HTTP Handlers for Images in ASP.NET
          http://www.c-sharpcorner.com/UploadFile/desaijm/HTTPHandlersForImages1115200

          5062705AM/HTTPHandlersFor Images.aspx

          Please feel free to post here if you have any other thought or ideas.

          Sincerely,

          Steven Cheng

          Microsoft MSDN Online Support Lead


          Delighting our customers is our #1 priority. We welcome your comments and
          suggestions about how we can improve the support we provide to you. Please
          feel free to let my manager know what you think of the level of service
          provided. You can send feedback directly to my manager at:
          msdnmg@microsof t.com.

          =============== =============== =============== =====
          Get notification to my posts through email? Please refer to
          http://msdn.microsoft.com/en-us/subs...#notifications.
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          This posting is provided "AS IS" with no warranties, and confers no rights.

          --------------------
          >From: "Tomasz J" <oegweb@nospam. nospam>
          >Subject: RewritePath in HttpHandler - how to?
          >Date: Thu, 25 Sep 2008 01:11:47 +0200
          >Hello Developers,
          >
          >I have a following problem: I need to write a HttpHandler rewriting
          requests
          >like:
          >/Resource.axd?re sid=1 to /someimage.gif
          >
          >My HttpHandler is listed in the web.config, its ProcessRequest( ) method
          gets
          >called but I cannot get it to work.
          >If within IHttpHandler.Pr ocessRequest() method instead of RewritePath()
          >method I use Server.Transfer () it works in IE but FireFox instead of
          images
          >shows text garbage. I suspect Response.Conten tType is incorrect and
          FireFox
          >is just more sensitive.
          >
          >Has anyone managed to handle a similar scenario where not only path gets
          >rewritten but also the resource type?
          >Why RewritePath() called within IHttpHandler.Pr ocessRequest() does not
          seem
          >to work?
          >
          >Thank you for any hints.
          >
          >Tomasz
          >
          >

            Comment

            • Steven Cheng
              #4
              RE: RewritePath in HttpHandler - how to?

              Hi Tomasz,

              How are you doing? Have you got any progress on this?

              Sincerely,

              Steven Cheng

              Microsoft MSDN Online Support Lead


              Delighting our customers is our #1 priority. We welcome your comments and
              suggestions about how we can improve the support we provide to you. Please
              feel free to let my manager know what you think of the level of service
              provided. You can send feedback directly to my manager at:
              msdnmg@microsof t.com.

              =============== =============== =============== =====
              Get notification to my posts through email? Please refer to
              http://msdn.microsoft.com/en-us/subs...#notifications.
              =============== =============== =============== =====
              This posting is provided "AS IS" with no warranties, and confers no rights.

              --------------------
              >From: "Tomasz J" <oegweb@nospam. nospam>
              >Subject: RewritePath in HttpHandler - how to?
              >Date: Thu, 25 Sep 2008 01:11:47 +0200
              >
              >Hello Developers,
              >
              >I have a following problem: I need to write a HttpHandler rewriting
              requests
              >like:
              >/Resource.axd?re sid=1 to /someimage.gif
              >
              >My HttpHandler is listed in the web.config, its ProcessRequest( ) method
              gets
              >called but I cannot get it to work.
              >If within IHttpHandler.Pr ocessRequest() method instead of RewritePath()
              >method I use Server.Transfer () it works in IE but FireFox instead of
              images
              >shows text garbage. I suspect Response.Conten tType is incorrect and
              FireFox
              >is just more sensitive.
              >
              >Has anyone managed to handle a similar scenario where not only path gets
              >rewritten but also the resource type?
              >Why RewritePath() called within IHttpHandler.Pr ocessRequest() does not
              seem
              >to work?
              >
              >Thank you for any hints.
              >
              >Tomasz
              >
              >

                Comment

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