We are upgrading our application from .net framework to .net core 2.0.
In it, we use a HttpWebRequest
to contact a site with AllowAutoRedirect
set to false. When the code executed request.GetResponse()
The site will return a 302 response, which in .net framework is OK - you can take response and handle it (we are after the set-cookie
header value).
However, in .net core 2.0, a WebException gets thrown:
The remote server returned an error: (302) Found.
Is my understanding incorrect in that a 302 should result in an exception being thrown, rather if AllowAutoRedirect is set to false then the response should still be returned? Is there any way to trigger the same behavior experienced in .net framework?
What is an HTTP 302? The 302 status code is a redirection message that occurs when a resource or page you're attempting to load has been temporarily moved to a different location.
I got the same error when setting AllowAutoRedirect
to false
.
I solved the problem by just wrapping a try-catch
-block around request.GetResponse()
and assigning the Result of the exception to a variable
WebResponse response;
try {
response = request.GetResponse();
}
catch(WebException e)) {
if(e.Message.Contains("302")
response = e.Result;
}
Take a look at this issue - HttpWebRequest in .NET Core 2.0 throwing 301 Moved Permanently. In short, it says:
If you set
AllowAutoRedirect
, then you will end up not following the redirect. That means ending up with the 301 response.
HttpWebRequest
(unlikeHttpClient
) throws exceptions for non-successful (non-200) status codes. So, getting an exception (most likely aWebException
) is expected.So, if you need to handle that redirect (which is HTTPS -> HTTP by the way), you need to trap it in try/catch block and inspect the
WebException
etc. That is standard use ofHttpWebRequest
.That is why we recommend devs use
HttpClient
which has an easier use pattern.
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