Why cant I see the Content-Encoding: gzip response in my c# HttpClient response header? -

i'm making simple c# program establish if server side compression available/enabled on various servers. request code below.

using (var client = new httpclient()) {     client.timeout = new timespan(0, 0, 5);     client.defaultrequestheaders.add("accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");     client.defaultrequestheaders.add("user-agent", "mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, gecko) chrome/48.0.2564.97 safari/537.36");     client.defaultrequestheaders.add("accept-encoding", "gzip, deflate, sdch, br");     var httpclientresponse = client.getasync(websiteurl).result;     string header = httpclientresponse.headers.getvalues("content-encoding").first(); } 

i can see watching request in fiddler compression enabled request can't seem extract information response headers in code.

these full headers request , response.

get https://www.dobbies.com/ http/1.1 accept: text/html, application/xhtml+xml, application/xml; q=0.9, image/webp, */*; q=0.8 user-agent: mozilla/5.0 (windows nt 6.1; wow64) applewebkit/537.36 (khtml, gecko) chrome/48.0.2564.97 safari/537.36 accept-encoding: gzip, deflate, sdch, br host: www.dobbies.com  http/1.1 200 ok cache-control: private content-type: text/html; charset=utf-8 content-encoding: gzip vary: accept-encoding server:  set-cookie: asp.net_sessionid=hx1rb34ottgfritgt3rciql4; path=/; secure; httponly x-frame-options: sameorigin x-content-type-options: nosniff strict-transport-security: max-age=31536000 x-xss-protection: 1; mode=block date: fri, 07 apr 2017 08:06:17 gmt content-length: 16836 

this when use httpclientresponse.headers

{     vary: accept-encoding     x-frame-options: sameorigin     x-content-type-options: nosniff     strict-transport-security: max-age=31536000     x-xss-protection: 1; mode=block     cache-control: private     date: fri, 07 apr 2017 08:06:17 gmt     set-cookie: asp.net_sessionid=hx1rb34ottgfritgt3rciql4; path=/; secure; httponly     server:  } 

as can see header of content-encoding: gzip missing in response.

why header missing? along others. give me headers!

found problem.

the httpresponsemessage returned httpclient methods has 2 header properties:

httpresponsemessage.headers httpresponseheaders generic response headers

httpresponsemessage.content.headers httpcontentheaders content-specific headers content-type