fix: fill out content type and content length in discovery

Author: richardapeters

postmaster/instantiations/HttpPageDiscovery.cpp

@@ -42,4 +42,9 @@ namespace application
                 device.Add("attributes", postmaster.attributes);
             });
     }
+
+    infra::BoundedConstString HttpPageDiscovery::ContentType() const
+    {
+        return "application/json";
+    }
 }

postmaster/instantiations/HttpPageDiscovery.hpp

@@ -14,12 +14,13 @@ namespace application
         HttpPageDiscovery(infra::BoundedConstString path, application::PostmasterDiscovery& discovery);
 
         // Implementation of SimpleHttpPage
-        virtual bool ServesRequest(const infra::Tokenizer& pathTokens) const override;
-        virtual void RespondToRequest(services::HttpRequestParser& parser, services::HttpServerConnection& connection) override;
+        bool ServesRequest(const infra::Tokenizer& pathTokens) const override;
+        void RespondToRequest(services::HttpRequestParser& parser, services::HttpServerConnection& connection) override;
 
         // Implementation of HttpResponse
-        virtual infra::BoundedConstString Status() const override;
-        virtual void WriteBody(infra::TextOutputStream& stream) const override;
+        infra::BoundedConstString Status() const override;
+        void WriteBody(infra::TextOutputStream& stream) const override;
+        infra::BoundedConstString ContentType() const override;
 
     private:
         infra::BoundedConstString path;