在使用日志请求/响应消息的HttpClient [英] Logging request/response messages when using HttpClient

问题描述

我有一个做了POST如下面

I have a method that does a POST like below

var response = await client.PostAsJsonAsync(url, entity);

if (response.IsSuccessStatusCode)
{
        // read the response as strongly typed object
        return await response.Content.ReadAsAsync<T>();
}

我的问题是我怎么能获得该贴得到从实体对象的实际JSON。我想日志被张贴JSON，所以这将是不错的，如果没有我不得不做一个JSON序列化自己。

My question is how can I obtain the actual JSON that got posted from the entity object. I would like to log the JSON that gets POSTED, so it will be nice to have that without me having to do a json serialize myself.

推荐答案

如何，你可以做这样的一个例子：

An example of how you could do this:

一些注意事项：

• LoggingHandler 拦截请求它处理它 HttpClientHandler 并最终写入线前。

• LoggingHandler intercepts the request before it handles it to HttpClientHandler which finally writes to the wire.

PostAsJsonAsync 扩展内部创建一个 ObjectContent 当 ReadAsStringAsync（）是所谓的 LoggingHandler ，它会导致格式化 在 ObjectContent 序列化对象，这就是你看到的JSON内容的原因。

PostAsJsonAsync extension internally creates an ObjectContent and when ReadAsStringAsync() is called in the LoggingHandler, it causes the formatter inside ObjectContent to serialize the object and that's the reason you are seeing the content in json.

日志处理程序：

public class LoggingHandler : DelegatingHandler
{
    public LoggingHandler(HttpMessageHandler innerHandler)
        : base(innerHandler)
    {
    }

    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        Console.WriteLine("Request:");
        Console.WriteLine(request.ToString());
        if (request.Content != null)
        {
            Console.WriteLine(await request.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);

        Console.WriteLine("Response:");
        Console.WriteLine(response.ToString());
        if (response.Content != null)
        {
            Console.WriteLine(await response.Content.ReadAsStringAsync());
        }
        Console.WriteLine();

        return response;
    }
}

链上面LoggingHandler与HttpClient的

HttpClient client = new HttpClient(new LoggingHandler(new HttpClientHandler()));
HttpResponseMessage response = client.PostAsJsonAsync(baseAddress + "/api/values", "Hello, World!").Result;

输出：

Request:
Method: POST, RequestUri: 'http://kirandesktop:9095/api/values', Version: 1.1, Content: System.Net.Http.ObjectContent`1[
[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], Headers:
{
  Content-Type: application/json; charset=utf-8
}
"Hello, World!"

Response:
StatusCode: 200, ReasonPhrase: 'OK', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Date: Fri, 20 Sep 2013 20:21:26 GMT
  Server: Microsoft-HTTPAPI/2.0
  Content-Length: 15
  Content-Type: application/json; charset=utf-8
}
"Hello, World!"

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