c# - How can I set User-Agent and Referer headers when using ClientWebSocket in .net 4.5? -

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the obvious answer of using clientwebsocket.setheader throws exception because it's protected header:

 system.argumentexception occurred   message=the 'user-agent' header must modified using appropriate property or method. parameter name: name   paramname=name   stacktrace:        @ system.net.webheadercollection.throwonrestrictedheader(string headername)

the exception string suggests using property/method on clientwebsocket can't find such property/method. seems exception designed httpwebrequest class, has such property.

the code, doesn't work:

clientwebsocket socket = new clientwebsocket(); // throw socket.options.setrequestheader("user-agent", "someuseragentstring"); // throw socket.options.setrequestheader("referer", "somereferer"]);

it doesn't you'll able set properties, @ least not right now. might able via reflection.

if closely @ stack trace, you'll see throwing method system.net.webheadercollection.throwonrestrictedheader. system.net.webheadercollection specialized name value collection designed deal http headers. if @ remarks section, you'll see following:

some common headers considered restricted , either exposed directly api (such content-type) or protected system , cannot changed.

the list has both user-agent , referer properties listed protected headers , cannot set since clientwebsocket not expose it.

all being said, though, if absolutely need set headers, you'll need find private reference webheadercollection of clientwebsocketoptions (exposed options property on clientwebsocket) , call protected addwithoutvalidate method set headers.


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