Comments on: ASP.NET Proxy Page – Used for Cross Domain Requests from AJAX and JavaScript

By: Bob

Bob — Wed, 25 Jan 2012 22:29:47 +0000

Did you publish your modified code anywhere? What you added sounds exactly like what I thought was missing from this great post.

By: Peter Neil

Peter Neil — Thu, 12 Jan 2012 13:49:10 +0000

Your REST based service is very RESTful if it isn’t using GET for READING DATA.

I can see that using a POST might be desirable to post to another server and make sure the Proxy follows any redirects for you.

By: Karl

Karl — Tue, 03 Jan 2012 20:53:51 +0000

In case you are using a REST based service and don’t want to use the ugly GET?

By: TimTim

TimTim — Tue, 20 Dec 2011 19:26:17 +0000

If anyone has the same problem as me I eventually found my answer here: http://stackoverflow.com/questions/1271701/reading-image-from-web-server-in-c-sharp-proxy

By: TimTim

TimTim — Tue, 13 Dec 2011 01:50:44 +0000

Thanks this proxy works great, except for images. Any image that is requested will not show in a browser due to “The image … cannot be displayed because it contains errors.” If I request an image and then request it via the proxy the first request returns fine and the 2nd returns this error message. Any suggestions? In case you are wondering I do have a valid case for requesting images – I’m performance testing mapping services via ajax

By: [SharePoint 2010] Cross-Domain Proxy Page for Client-Side Scripts « SharePoint John – John Chapman's Blog About SharePoint, ASP.NET, C#, jQuery, SQL

Tue, 13 Sep 2011 23:23:22 +0000

[...] 2010] Cross-Domain Proxy Page for Client-Side ScriptsFollowing my blog post about ASP.NET Proxy Pages for Client-Side Scripts I have created a SharePoint 2010 solution to add a proxy page to a SharePoint 2010 farm.CodePlex [...]

By: Tom C

Tom C — Sat, 03 Sep 2011 23:39:42 +0000

This is great thanks for sharing. With minor changes (accessing the Request object through context) I put this in an asynchronous HTTP handler for added efficiency and to support concurrency. I also updated a few things to support POST requests, as I do think this is worthwhile

By: Fabio

Fabio — Fri, 02 Sep 2011 21:39:50 +0000

Hi!
Thanks for the solution.
I’m trying to use it for all requests (JS, Images, XML).
Unfortunately it’s not working…For example, I’m trying to get an image using the proxy, so I use the following URL

persacore.aspx?u=imagens/icones/tema_1/m/energia_m.png

but the browser does not recognize it as an image. The Content Type is correct. Any ideas?

By: Matthew Henry

Matthew Henry — Thu, 19 May 2011 18:49:27 +0000

You also need to copy the user-agent
request.UserAgent = Request.UserAgent;

By: Dan

Dan — Wed, 04 May 2011 10:57:31 +0000

John,

I also have the requiremnt to proxy the SRC attribute of an image. The scenario is that a page reads the contents of an RSS feed (not my own) which resides on a different domain. The description tag of the RSS feed contains HTML mark-up included within it including an image.

The image doesn’t currently display which i believe is due to the cross domain requests restriction. I would like to deliver the contents of the image via a proxy page in a similar to which you have described. I have based my attempt on your example provided but have been unable to get it to work.

By: John Chapman

John Chapman — Mon, 07 Mar 2011 21:56:22 +0000

Can you explain the scenario a bit more? I’m not sure I see a correlation between this proxy solution to populating the src for an image.

By: Nico Witteman

Nico Witteman — Sun, 06 Mar 2011 14:21:09 +0000

Lovely and simple.

I would very much to use this to set the src-attribute for an img, but it does not seem to work. Any ideas?

By: Romona

Romona — Wed, 27 Oct 2010 04:58:24 +0000

It is great to see what is possible!

By: Andy R

Andy R — Mon, 06 Sep 2010 13:31:15 +0000

After seeing this, http://www.experts-exchange.com/Q_26452332.htm, I can think of several situations where you might want to “POST” data to a remote web-service, and stick the results in a local page e.g.
* Exchange rate conversion,
* Stock price lookup,
* delivery rate lookup.
Personally I’d use Apache to Reverse Proxy the requests to the remote site, by adding the entries below to the httpd.conf, but there are plenty of equivalents for IIS, out there e.g. http://www.codeproject.com/KB/web-security/HTTPReverseProxy.aspx

#— cut ‘n’ paste into you Apache httpd.conf —
ProxyRequests Off

Order deny,allow
Allow from all

ProxyPass /proxy http://www.some.webservice
ProxyPassReverse /proxy http://www.some.webservice
#—- Cut ends —

By: John Chapman

John Chapman — Fri, 03 Sep 2010 14:57:26 +0000

In what scenario would you want to POST to this proxy page?

By: Michael H

Michael H — Wed, 01 Sep 2010 18:57:43 +0000

But it doesn’t support POST.

By: Kevon K. Hayes

Kevon K. Hayes — Tue, 17 Aug 2010 18:39:05 +0000

Well done. Good to see what’s possible.

By: John Chapman

John Chapman — Tue, 03 Aug 2010 14:14:36 +0000

That is exactly what I use this for. I place the page in the LAYOUTS folder on the server to make it available to all the SP sites. I primarily use it for consuming RSS feeds across domains.

By: Jaosn Kuter

Jaosn Kuter — Mon, 02 Aug 2010 21:09:58 +0000

Brilliantly simple solution, thanks! This will work wonders on our SharePoint intranet.