Print body as binary

src/brpc/details/http_message.cpp

@@ -456,7 +456,7 @@ ssize_t HttpMessage::ParseFromIOBuf(const butil::IOBuf &buf) {
         if (_parser.http_errno != 0) {
             // May try HTTP on other formats, failure is norm.
             RPC_VLOG << "Fail to parse http message, parser=" << _parser
-                     << ", buf=`" << buf << '\'';
+                     << ", buf=`" << butil::PrintedAsBinary(buf) << '\'';
             return -1;
         }
         if (Completed()) {