c# - HttpRequestMessage UserAgent with Colon -


i'm trying send request has user agent set colon in it, httprequestmessage complaining colon invalid character.

the exact code looks this:

httpclient client = new httpclient();  var request = new httprequestmessage()     {         requesturi = new uri("some-uri"),         method = httpmethod.post     };  request.headers.add("user-agent", "sample:text");  // send request...

i looked through this post can see ebnf of user agent , this rfc specifies ctl is.

the first link says following valid user agent:

token = 1*<any char except ctls or separators>

and second link defines ctl as:

any us-ascii control character (octets 0 - 31) , del (127)

but, colon (:) 58 on ascii table, don't see why problem.

i assumed httprequestmessage not colons in because it's not escaped -- thinks it's separator. tried escaping in single quotes, double quotes, etc.

is there way escape i'm missing?

or in other words, how send colon (:) in user agent header of httprequestmessage?

this turned out escaping issue suspected. doesn't seem httprequestmessage handles automatic escaping.

i'm able use uri.escapedatastring() convert colon before adding user-agent header. when process user-agent on endpoint, have use uri.unescapedatastring()

not pretty, seems work.


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