lib/httpx/plugins/grpc.rb in httpx-1.1.5 vs lib/httpx/plugins/grpc.rb in httpx-1.2.0

@@ -259,17 +259,17 @@
             # convert to milliseconds
             deadline = (deadline * 1000.0).to_i
             headers["grpc-timeout"] = "#{deadline}m"
           end
 
-          headers = headers.merge(metadata) if metadata
+          headers = headers.merge(metadata.transform_keys(&:to_s)) if metadata
 
           # prepare compressor
           compression = @options.grpc_compression == true ? "gzip" : @options.grpc_compression
 
           headers["grpc-encoding"] = compression if compression
 
-          headers.merge!(@options.call_credentials.call) if @options.call_credentials
+          headers.merge!(@options.call_credentials.call.transform_keys(&:to_s)) if @options.call_credentials
 
           build_request("POST", uri, headers: headers, body: input)
         end
       end
     end