Set correct content type and send once (#1965)

Set correct Content-Type headers on each endpoint rather than on the router. The router would, at times, send two Content-Type headers and other times just send the wrong one.

cmd/proxy/actions/app.go

@@ -52,7 +52,6 @@ func App(logger *log.Logger, conf *config.Config) (http.Handler, error) {
 			SSLRedirect:     conf.ForceSSL,
 			SSLProxyHeaders: map[string]string{"X-Forwarded-Proto": "https"},
 		}).Handler,
-		mw.ContentType,
 	)
 
 	var subRouter *mux.Router

cmd/proxy/actions/catalog.go

@@ -23,6 +23,7 @@ func catalogHandler(s storage.Backend) http.HandlerFunc {
 	const op errors.Op = "actions.CatalogHandler"
 	cs, isCataloger := s.(storage.Cataloger)
 	f := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		if !isCataloger {
 			w.WriteHeader(errors.KindNotImplemented)
 			return

cmd/proxy/actions/health.go

@@ -5,5 +5,6 @@ import (
 )
 
 func healthHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(http.StatusOK)
 }

cmd/proxy/actions/home.go

@@ -125,7 +125,7 @@ func proxyHomeHandler(c *config.Config) http.HandlerFunc {
 			w.WriteHeader(http.StatusInternalServerError)
 		}
 
-		w.Header().Add("Content-Type", "text/html")
+		w.Header().Set("Content-Type", "text/html")
 		w.WriteHeader(http.StatusOK)
 
 		err = tmp.ExecuteTemplate(w, "home", templateData)

cmd/proxy/actions/index.go

@@ -23,6 +23,8 @@ func indexHandler(index index.Indexer) http.HandlerFunc {
 			http.Error(w, err.Error(), errors.Kind(err))
 			return
 		}
+
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		enc := json.NewEncoder(w)
 		for _, meta := range list {
 			if err = enc.Encode(meta); err != nil {

cmd/proxy/actions/readiness.go

@@ -9,6 +9,7 @@ import (
 func getReadinessHandler(s storage.Backend) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		if _, err := s.List(r.Context(), "github.com/gomods/athens"); err != nil {
+			w.Header().Set("Content-Type", "application/json; charset=utf-8")
 			w.WriteHeader(http.StatusInternalServerError)
 		}
 	}

cmd/proxy/actions/robots.go

@@ -9,6 +9,7 @@ import (
 // robotsHandler implements GET baseURL/robots.txt.
 func robotsHandler(c *config.Config) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		http.ServeFile(w, r, c.RobotsFile)
 	}
 }

cmd/proxy/actions/version.go

@@ -9,4 +9,6 @@ import (
 
 func versionHandler(w http.ResponseWriter, r *http.Request) {
 	_ = json.NewEncoder(w).Encode(build.Data())
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.WriteHeader(http.StatusOK)
 }

pkg/download/latest.go

@@ -17,6 +17,7 @@ const PathLatest = "/{module:.+}/@latest"
 func LatestHandler(dp Protocol, lggr log.Entry, df *mode.DownloadFile) http.Handler {
 	const op errors.Op = "download.LatestHandler"
 	f := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		mod, err := paths.GetModule(r)
 		if err != nil {
 			lggr.SystemErr(errors.E(op, err))

pkg/download/list.go

@@ -18,6 +18,7 @@ const PathList = "/{module:.+}/@v/list"
 func ListHandler(dp Protocol, lggr log.Entry, df *mode.DownloadFile) http.Handler {
 	const op errors.Op = "download.ListHandler"
 	f := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		mod, err := paths.GetModule(r)
 		if err != nil {
 			lggr.SystemErr(errors.E(op, err))

pkg/download/version_info.go

@@ -15,6 +15,7 @@ const PathVersionInfo = "/{module:.+}/@v/{version}.info"
 func InfoHandler(dp Protocol, lggr log.Entry, df *mode.DownloadFile) http.Handler {
 	const op errors.Op = "download.InfoHandler"
 	f := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json; charset=utf-8")
 		mod, ver, err := getModuleParams(r, op)
 		if err != nil {
 			lggr.SystemErr(err)

pkg/download/version_module.go

@@ -15,6 +15,7 @@ const PathVersionModule = "/{module:.+}/@v/{version}.mod"
 func ModuleHandler(dp Protocol, lggr log.Entry, df *mode.DownloadFile) http.Handler {
 	const op errors.Op = "download.VersionModuleHandler"
 	f := func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "text/plain; charset=utf-8")
 		mod, ver, err := getModuleParams(r, op)
 		if err != nil {
 			err = errors.E(op, errors.M(mod), errors.V(ver), err)