Add Server field in HTTP API

Resolves #625
Included in tests.

License: MIT
Signed-off-by: Jakub (Kubuxu) Sztandera <kubuxu@gmail.com>

commands/http/handler.go

@@ -261,7 +261,9 @@ func sendResponse(w http.ResponseWriter, r *http.Request, res cmds.Response, req
 	h.Set("Access-Control-Allow-Headers", "X-Stream-Output, X-Chunked-Output")
 	// expose those headers
 	h.Set("Access-Control-Expose-Headers", "X-Stream-Output, X-Chunked-Output")
-
+	// Expose our agent to allow identification
+	h.Set("Server", "go-ipfs/" + config.CurrentVersionNumber)
+
 	if r.Method == "HEAD" { // after all the headers.
 		return
 	}

test/sharness/t0230-channel-streaming-http-content-type.sh

@@ -24,6 +24,7 @@ test_ls_cmd() {
 		printf "Access-Control-Allow-Headers: X-Stream-Output, X-Chunked-Output\r\n" >>expected_output &&
 		printf "Access-Control-Expose-Headers: X-Stream-Output, X-Chunked-Output\r\n" >>expected_output &&
 		printf "Content-Type: text/plain\r\n" >>expected_output &&
+		printf "Server: go-ipfs/%s\r\n" $(ipfs version | cut -d" " -f 3) >>expected_output &&
 		printf "Trailer: X-Stream-Error\r\n" >>expected_output &&
 		printf "Transfer-Encoding: chunked\r\n" >>expected_output &&
 		printf "X-Chunked-Output: 1\r\n" >>expected_output &&
@@ -46,6 +47,7 @@ test_ls_cmd() {
 		printf "Access-Control-Allow-Headers: X-Stream-Output, X-Chunked-Output\r\n" >>expected_output &&
 		printf "Access-Control-Expose-Headers: X-Stream-Output, X-Chunked-Output\r\n" >>expected_output &&
 		printf "Content-Type: application/json\r\n" >>expected_output &&
+		printf "Server: go-ipfs/%s\r\n" $(ipfs version | cut -d" " -f 3) >>expected_output &&
 		printf "Trailer: X-Stream-Error\r\n" >>expected_output &&
 		printf "Transfer-Encoding: chunked\r\n" >>expected_output &&
 		printf "X-Chunked-Output: 1\r\n" >>expected_output &&