Web request handler in .net core not found?

Question

Basically I migrate from .framework to .core then I faced one error, Web request handler is not found. I searched alternate methods for .netcore here.

Is there any other method of registering web request handler?

error

Severity    Code    Description Project File    Line    Suppression State
Error   CS0246  The type or namespace name 'WebRequestHandler' could not be found 
(are you missing a using directive or an assembly reference?)

public HttpClient ConfigureHttpClient(Configuration.Configuration config)
{
    WebRequestHandler mtlsHandler = new WebRequestHandler
    {
        UseProxy = true,
        UseCookies = false,
        CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore),
        AuthenticationLevel = AuthenticationLevel.MutualAuthRequired,
        AllowAutoRedirect = false
    };
}

I guess you'd better share your code for us to see what is it actually doing. I don't believe you actually need it in the first place. — Milad Soghrati, May 24 '20 at 06:23
this does not require any code .this issue is already face by many other .i given link of two. — , May 25 '20 at 04:05

score 12 · Answer 1 · answered May 30 '20 at 18:42

In .netcore an equivalent would be HttpClientHandler, described here. For some of the reasons mentioned in the post you have referenced already, HttpClientHandler exposes less options than WebRequestHandler.

Below is the code that configures HttpClient in a manner similar to your example, using HttpClientHandler:

var mtlsHandler = new HttpClientHandler {
   UseProxy = true,
   UseCookies = false,
   AllowAutoRedirect = false
   // CachePolicy = ... not supported and set to HttpRequestLevel.BypassCache equivalent, see https://github.com/dotnet/runtime/issues/21799
   // AuthenticationLevel = ... need to implement it yourself by deriving from HttpClientHandler, see https://stackoverflow.com/questions/43272530/whats-the-alternative-to-webrequesthandler-in-net-core
};

var httpClient = new HttpClient(mtlsHandler);

Unfortunately there are 2 unresolved aspects remaining, both which require to do your own custom implementation on top of HttpClientHandler:

No support for CachePolicy other than BypassCache equivalent, discussed here.
No support for AuthenticationLevel, discussed here.

Web request handler in .net core not found?

1 Answers1