Re: HttpWebRequest and Host header (ANSWERED)
From: Feroze [msft] (ferozed_at_online.microsoft.com)
Date: 03/25/05
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Date: Fri, 25 Mar 2005 15:38:35 -0800
Yes, this will work. However there is a subtle difference in the request
headers sent with this method, and what the actual request should be
according to RFC.
Using the suggested method, the request that will be sent is this:
GET http://www.company.com/test.aspx HTTP/1.1
Host: www.company.com
<other http headers>
What the RFC expects in this situation in this:
GET /test.aspx HTTP/1.1
Host: www.company.com
<other http headers>
As per RFC Section 5.2:
===
An origin server that does differentiate resources based on the host
requested (sometimes referred to as virtual hosts or vanity host
names) MUST use the following rules for determining the requested
resource on an HTTP/1.1 request:
1. If Request-URI is an absoluteURI, the host is part of the
Request-URI. Any Host header field value in the request MUST be
ignored.
===
If a server gets a request with an absolute URI, it is supposed to ignore
the host header. Note that although the host header is being ignored, it
will still work because the absolute URI contains the host you want to send
this to.
-- feroze ----------------- This posting is provided as-is. It offers no warranties and assigns no rights. See http://weblogs.asp.net/feroze_daud for System.Net related posts. ---------------- "Dave P." <dpurrington.ng@mailnull.com> wrote in message news:#1$yduXMFHA.3928@TK2MSFTNGP09.phx.gbl... > Oops. That should read WebProxy, not CustomWebProxy. > > "Dave P." <dpurrington.ng@mailnull.com> wrote in message > news:u25%23wZXMFHA.1528@TK2MSFTNGP09.phx.gbl... > > Mark: > > > > You can accomplish this by using the Proxy property on HttpWebRequest. > Use > > the host header value as the host in your URL. Then, set your proxy > object > > to translate the address to your actual target host. > > > > So, using your example: > > Uri uri = new Uri("http://www.company.com"); > > > > WebRequest request = WebRequest.Create(uri); > > > > request.Proxy = new CustomWebProxy("http://frontend1.east.company.com"); > > > > request.GetResponse(); > > > > The end result will be to have the host header of www.company.com , but > > still be GETting the request from "frontend1.east.company.com" Keep in > > mind that that this code will have all of your requests going to the same > > host. > > > > Hope that helps, > > Dave P. > > (dpurrington.ng2ATmailnullDAHTcom) > > > > > > "Mark" <mmodrall@nospam.nospam> wrote in message > > news:AD5BD471-3EFE-49B8-A780-91B922E8BE54@microsoft.com... > > > Hi... > > > > > > I've been working a bit with the HttpWebRequest class and one > requirement > > > I've gotten recently is the desire to set the HTTP Host: header > separately > > > from the specific machine referenced in the url. For example, the url > > > http://frontend1.east.company.com > > > but passing > > > Host: www.company.com > > > to emulate a call to the general front door. > > > > > > I look in the HttpWebRequest documentation on MSDN, and under the > Headers > > > property, it says specifically that the Host header's derived from the > url > > > (implying that it can't be overridden). > > > > > > Is there any way to do what I want to do? > > > > > > Thanks > > > _mark > > > > > > > > >
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