在HttpClient中显式设置要获取操作的内容类型标题

问题描述

有没有一种方法可以在执行 GET 时显式设置 Content-Type 标头值 HttpClient ？

我意识到这打破了1.1协议，但是我使用的是不符合该协议的API ，并要求我设置 Content-Type 标头。

我尝试了此操作，但无济于事...

 使用（var httpClient = new HttpClient（））
 {
 var httpRequestMessage = new HttpRequestMessage（HttpMethod .get， http://example.com）； 
 
 httpClient.DefaultRequestHeaders.TryAddWithoutValidation（ Content-Type， application / x-www-form-urlencoded + v1.3）; 
 
等待httpClient.SendAsync（httpRequestMessage）
} 
  

I在添加 TryAddWithoutValidation 之后检查了 DefaultRequestHeaders ，它似乎没有设置 Content-Type 值。

如果我尝试设置httpRequestMessage的Content-Type（通过设置 httpRequestMessage.Content = ... ，出现以下错误：

 无法发送具有这种动词类型的内容主体。
  

有没有一种方法可以显式设置 Content-Type 使用HttpClient进行 GET 操作？

解决方案

基于我的发现，我得出结论： HttpClient在协议规则方面非常严格。我还通过实现DLL进行了反思，但找不到任何表明它允许违反协议的内容。

我认为当您尝试设置内容类型标头时，异常消息会被HttpClient强制执行。是自描述性的：

如果使用set内容主体，您还会收到另一条自我描述的消息：

由于您愿意违反GET请求的HTTP规则，因此我确定您唯一的选择是坚持使用限制性较小的WebClient，在这种情况下也可以使用。

Is there a way in which I can explicitly set the Content-Type header values when performing a GET with HttpClient ?

I realise this breaks 1.1 protocol, but I am working with a API that does not conform to it, and REQUIRES I set a Content-Type Header.

I have tried this with to no avail...

using (var httpClient = new HttpClient())
{
   var httpRequestMessage = new HttpRequestMessage(HttpMethod.Get, "http://example.com");

   httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/x-www-form-urlencoded+v1.3");

   await httpClient.SendAsync(httpRequestMessage)
}

I've inspected the DefaultRequestHeaders after the TryAddWithoutValidation is added, and it does not seem to be setting the Content-Type value.

If I try to set the Content-Type of the httpRequestMessage (by setting httpRequestMessage.Content = ..., I get the following error:

Cannot send a content-body with this verb-type.

Is there a way that I can explicitly set the Content-Type for a GET operation using the HttpClient?

解决方案

Based on my findings i concluded the HttpClient is very restrictive in terms of the protocol rules. I also reflected through the implementation DLL and i couldn't find anything that it would indicate that it allows protocol violations.

GET requests shouldn't have content-type headers, and the HttpClient is enforcing that rule.

I think the exception message when you try to set the content-type header is self-descriptive:

Also if you use set the content body you get one more self-descriptive message:

Since you are willing to violate HTTP rules for GET requests i am pretty sure your only option is to stick with the less restrictive WebClient, which works in that scenario.

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