Setting the User-Agent header for a WebClient request

Question

What is the proper way of setting the User-Agent header for a WebClient request for Windows Phone 7  I found 2 options  but not sure which one is the correct one  Considering a WebClient object   WebClient client   new WebClient      I saw 2 options    set the User-Agent using    client Headers  User-Agent      myUserAgentString    set the User-Agent using the WebHeaderCollection   WebHeaderCollection headers   new WebHeaderCollection    headers HttpRequestHeader UserAgent     userAgentString   client Headers   headers     Can you please advise which of the 2 methods above is the proper one

User · Answer

You can also use that   client Headers Add HttpRequestHeader UserAgent   My app

User · Answer

I found that the WebClient kept removing my User-Agent header after one request and I was tired of setting it each time   I used a hack to set the User-Agent permanently by making my own custom WebClient and overriding the GetWebRequest method   Hope this helps    public class CustomWebClient   WebClient       public CustomWebClient          protected override WebRequest GetWebRequest Uri address                var request   base GetWebRequest address  as HttpWebRequest          request UserAgent  Mozilla 4 0  compatible  MSIE 7 0  Windows NT 6 1  WOW64  Trident 6 0                    your other custom code             return request

User · Answer

As a supplement to the other answers  here is Microsoft s guidance for user agent strings for its browsers  The user agent strings differ by browser  Internet Explorer and Edge  and operating system  Windows 7  8  10 and Windows Phone    For example  here is the user agent string for Internet Explorer 11 on Windows 10   Mozilla 5 0  Windows NT 10 0  WOW64  Trident 7 0  rv 11 0  like Gecko    and for Internet Explorer for Windows Phone 8 1 Update   Mozilla 5 0  Mobile  Windows Phone 8 1  Android 4 0  ARM  Trident 7 0  Touch  rv 11 0  IEMobile 11 0  NOKIA  Lumia 520  like iPhone OS 7 0 3 Mac OS X AppleWebKit 537  KHTML  like Gecko  Mobile Safari 537   Templates are given for the user agent strings for the Edge browser for Desktop  Mobile and WebView  See this answer for some Edge user agent string examples   Finally  another page on MSDN provides guidance for IE11 on older desktop operating systems   IE11 on Windows 8 1   Mozilla 5 0  Windows NT 6 3  Trident 7 0  rv 11 0  like Gecko   and IE11 on Windows 7   Mozilla 5 0  Windows NT 6 1  Trident 7 0  rv 11 0  like Gecko

User · Answer

const string ua    Mozilla 5 0  compatible  MSIE 9 0  Windows NT 6 1  WOW64  Trident 5 0    Request Headers  User-Agent     ua  var httpWorkerRequestField   Request GetType   GetField   wr   BindingFlags Instance   BindingFlags NonPublic   if  httpWorkerRequestField    null        var httpWorkerRequest   httpWorkerRequestField GetValue Request       var knownRequestHeadersField   httpWorkerRequest GetType   GetField   knownRequestHeaders   BindingFlags Instance   BindingFlags NonPublic       if  knownRequestHeadersField    null                string   knownRequestHeaders    string   knownRequestHeadersField GetValue httpWorkerRequest                       knownRequestHeaders 39    ua

User · Answer

This worked for me   var message   new HttpRequestMessage method  url   message Headers TryAddWithoutValidation  user-agent     lt user agent header value gt     var client   new HttpClient    var response   await client SendAsync message     Here you can find the documentation for TryAddWithoutValidation

User · Answer

You can check the WebClient documentation for a C  sample that adds a User-Agent to your WebClient and here for a sample for Windows Phone   This is the sample for C     WebClient client   new WebClient         Add a user agent header in case the     requested URI contains a query   client Headers Add   user-agent    Mozilla 4 0  compatible  MSIE 6 0                                          Windows NT 5 2   NET CLR 1 0 3705        This is a sample for Windows Phone  Silverlight    request Headers  UserAgent      appname      OR request UserAgent    appname

[c#] Setting the User-Agent header for a WebClient request

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