Logging request response messages when using HttpClient

Question

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 lt T gt         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

User · Answer

Network tracing also available for next objects (see article on msdn)

System.Net.Sockets Some public methods of the Socket, TcpListener, TcpClient, and Dns classes
System.Net Some public methods of the HttpWebRequest, HttpWebResponse, FtpWebRequest, and FtpWebResponse classes, and SSL debug information (invalid certificates, missing issuers list, and client certificate errors.)
System.Net.HttpListener Some public methods of the HttpListener, HttpListenerRequest, and HttpListenerResponse classes.
System.Net.Cache Some private and internal methods in System.Net.Cache.
System.Net.Http Some public methods of the HttpClient, DelegatingHandler, HttpClientHandler, HttpMessageHandler, MessageProcessingHandler, and WebRequestHandler classes.
System.Net.WebSockets.WebSocket Some public methods of the ClientWebSocket and WebSocket classes.

Put next lines of code to the configuration file

<configuration>  
  <system.diagnostics>  
    <sources>  
      <source name="System.Net" tracemode="includehex" maxdatasize="1024">  
        <listeners>  
          <add name="System.Net"/>  
        </listeners>  
      </source>  
      <source name="System.Net.Cache">  
        <listeners>  
          <add name="System.Net"/>  
        </listeners>  
      </source>  
      <source name="System.Net.Http">  
        <listeners>  
          <add name="System.Net"/>  
        </listeners>  
      </source>  
      <source name="System.Net.Sockets">  
        <listeners>  
          <add name="System.Net"/>  
        </listeners>  
      </source>  
      <source name="System.Net.WebSockets">  
        <listeners>  
          <add name="System.Net"/>  
        </listeners>  
      </source>  
    </sources>  
    <switches>  
      <add name="System.Net" value="Verbose"/>  
      <add name="System.Net.Cache" value="Verbose"/>  
      <add name="System.Net.Http" value="Verbose"/>  
      <add name="System.Net.Sockets" value="Verbose"/>  
      <add name="System.Net.WebSockets" value="Verbose"/>  
    </switches>  
    <sharedListeners>  
      <add name="System.Net"  
        type="System.Diagnostics.TextWriterTraceListener"  
        initializeData="network.log"  
      />  
    </sharedListeners>  
    <trace autoflush="true"/>  
  </system.diagnostics>  
</configuration>

User · Answer

An example of how you could do this   Some notes    LoggingHandler intercepts the request before it handles it to HttpClientHandler which finally writes to the wire  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    Logging handler   public class LoggingHandler   DelegatingHandler       public LoggingHandler HttpMessageHandler innerHandler            base innerHandler                   protected override async Task lt HttpResponseMessage gt  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            Chain the above LoggingHandler with HttpClient   HttpClient client   new HttpClient new LoggingHandler new HttpClientHandler      HttpResponseMessage response   client PostAsJsonAsync baseAddress     api values    Hello  World    Result    Output   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

User · Answer

The easiest solution would be to use Wireshark and trace the HTTP tcp flow

User · Answer

See http   mikehadlow blogspot com 2012 07 tracing-systemnet-to-debug-http-clients html To configure a System Net listener to output to both the console and a log file  add the following to your assembly configuration file   lt system diagnostics gt     lt trace autoflush  quot true quot    gt     lt sources gt       lt source name  quot System Net quot  gt         lt listeners gt           lt add name  quot MyTraceFile quot   gt           lt add name  quot MyConsole quot   gt         lt  listeners gt       lt  source gt     lt  sources gt     lt sharedListeners gt       lt add       name  quot MyTraceFile quot        type  quot System Diagnostics TextWriterTraceListener quot        initializeData  quot System Net trace log quot    gt       lt add name  quot MyConsole quot  type  quot System Diagnostics ConsoleTraceListener quot    gt     lt  sharedListeners gt     lt switches gt       lt add name  quot System Net quot  value  quot Verbose quot    gt     lt  switches gt   lt  system diagnostics gt

[c#] Logging request/response messages when using HttpClient

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