fix POST requests to DELETE and PUT and fix double-free password in change_user.c

src/get_user.c

@@ -6,7 +6,7 @@ void get_user(struct mg_connection *c, struct mg_http_message *hm) {
   request_with_token *requestdata = check_body(hm);
   if (!jwt_verifyJWT(requestdata->token, JWT_DEFAULT_SECRET)) {
     free_request_with_token(requestdata);
-    mg_http_reply(c, 403, "", "{%m:%m}", MG_ESC("error"),
+    mg_http_reply(c, 403, "Content-Type: application/json\r\n", "{%m:%m}", MG_ESC("error"),
                   MG_ESC("invalid token"));
     return;
   }
@@ -18,7 +18,7 @@ void get_user(struct mg_connection *c, struct mg_http_message *hm) {
     free_request_with_token(requestdata);
     cJSON_Delete(payload);
     free(username);
-    mg_http_reply(c, 404, "", "{%m:%m}", MG_ESC("error"),
+    mg_http_reply(c, 404, "Content-Type: application/json\r\n", "{%m:%m}", MG_ESC("error"),
                   MG_ESC("user not found"));
     return;
   }