净HttpWebRequest.GetResponse（）时，HTTP状态code 400（错误请求）返回引发异常 [英] .Net HttpWebRequest.GetResponse() raises exception when http status code 400 (bad request) is returned

问题描述

我在的情况下，当我得到一个HTTP 400 code从服务器，它是服务器，告诉我什么是错的我的要求的完全合法的方式（使用HTTP响应内容的消息）

I am in a situation where when I get an HTTP 400 code from the server, it is a completely legal way of the server telling me what was wrong with my request (using a message in the HTTP response content)

但是，.NET的HttpWebRequest引发异常时的状态code为400。

However, the .NET HttpWebRequest raises an exception when the status code is 400.

我要如何处理呢？对我来说，400是完全合法的，并且相当有帮助的。 HTTP内容有一些重要的信息，但除了抛出我了我的道路。

How do I handle this? For me a 400 is completely legal, and rather helpful. The HTTP content has some important information but the exception throws me off my path.

推荐答案

这将是很好，如果有关闭的某种方式扔在非成功code，但如果你赶上WebException你至少可以使用回应：

It would be nice if there were some way of turning off "throw on non-success code" but if you catch WebException you can at least use the response:

using System;
using System.IO;
using System.Web;
using System.Net;

public class Test
{
    static void Main()
    {
        WebRequest request = WebRequest.Create("http://csharpindepth.com/asd");
        try
        {
            using (WebResponse response = request.GetResponse())
            {
                Console.WriteLine("Won't get here");
            }
        }
        catch (WebException e)
        {
            using (WebResponse response = e.Response)
            {
                HttpWebResponse httpResponse = (HttpWebResponse) response;
                Console.WriteLine("Error code: {0}", httpResponse.StatusCode);
                using (Stream data = response.GetResponseStream())
                using (var reader = new StreamReader(data))
                {
                    string text = reader.ReadToEnd();
                    Console.WriteLine(text);
                }
            }
        }
    }
}

您可能想封装的给我一个答复，即使它不是一个成功的code位在一个单独的方法。 （我建议你还是扔掉，如果没有响应，例如，如果您无法连接。）

You might like to encapsulate the "get me a response even if it's not a success code" bit in a separate method. (I'd suggest you still throw if there isn't a response, e.g. if you couldn't connect.)

如果错误响应可能很大（这是不寻常的），你可能需要调整<一href="https://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.defaultmaximumerrorresponselength"><$c$c>HttpWebRequest.DefaultMaximumErrorResponseLength以确保您得到整个错误。

If the error response may be large (which is unusual) you may want to tweak HttpWebRequest.DefaultMaximumErrorResponseLength to make sure you get the whole error.

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