feat support http_types ToString()

tile/net/http/types.cc

@@ -165,4 +165,14 @@ TryParseTraits<HttpVersion>::TryParse(Slice version) {
   return iter->second;
 }
 
+std::ostream &operator<<(std::ostream &os, HttpMethod method) {
+  return os << ToSlice(method);
+}
+std::ostream &operator<<(std::ostream &os, HttpStatus status) {
+  return os << ToSlice(status);
+}
+std::ostream &operator<<(std::ostream &os, HttpVersion version) {
+  return os << ToSlice(version);
+}
+
 } // namespace tile

tile/net/http/types.h

@@ -91,6 +91,10 @@ template <> struct TryParseTraits<HttpVersion> {
   static std::optional<HttpVersion> TryParse(Slice s);
 };
 
+std::ostream &operator<<(std::ostream &os, HttpMethod method);
+std::ostream &operator<<(std::ostream &os, HttpStatus status);
+std::ostream &operator<<(std::ostream &os, HttpVersion version);
+
 } // namespace tile
 
 #endif // _TILE_NET_HTTP_TYPES_H