Set Content-type "application/json" on responses

CHANGELOG.md

@@ -1,4 +1,5 @@
 ## 3.6.0 (unreleased)
+- [PR #195](https://github.com/rqlite/rqlite/pull/195): Set Content-type "application/json" on all HTTP responses.
 - [PR #193](https://github.com/rqlite/rqlite/pull/193): Allow joining a cluster through any node, not just the leader.
 - [PR #187](https://github.com/rqlite/rqlite/pull/187): Support memory profiling.
 - Go cyclo complexity changes.

http/service.go

@@ -200,6 +200,7 @@ func (s *Service) Close() {
 
 // ServeHTTP allows Service to serve HTTP requests.
 func (s *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	s.addBuildVersion(w)
 
 	if s.credentialStore != nil {
@@ -627,7 +628,6 @@ func queriesValid(queries []string) bool {
 
 // serveExpvar serves registered expvar information over HTTP.
 func serveExpvar(w http.ResponseWriter, r *http.Request) {
-	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	fmt.Fprintf(w, "{\n")
 	first := true
 	expvar.Do(func(kv expvar.KeyValue) {