How to get header value from Streaming.

Hello!

I do have a simple endpoint that streams objects from the database. In headers, I’m sending extra header with information about the total amount of items. The header is called total_count

I’m seeing the value in the response header in the network debugger. However, I’m unable to get it using your framework.

const headers = new grpc.Metadata();
headers.set('authorization', login?.accessToken || '');
const response = client.listDemoObjects(req, headers);
const items: DemoObject.AsObject[] = [];
let totalItems: number;

response.on('status', (status) => {
  console.log(status.code);
  console.log(status.details);
  console.log(status.metadata); // total_count is not here
});

response.on('end', (status) => {
  console.log(status); // total_count is not here
});

response.on('data', (data) => {
  items.push(data.toObject()); // total_count is not here
});

How can I get response headers?

To be 100% clear I’m not using trailers. 😃

[lukasmoellerch]

As noted here you should be able to read the response headers in the "metadata" event. The GrpcWebClientReadableStream implementation directly reads the response headers from the xhr event and will emit the corresponding event.

[singerxt]

Hello!

You have to add an additional header in the envoy server so that grpc lib will be able to use it. In my case it was.

expose_headers: grpc-status,grpc-message,total_items

I’m closing this issue as not an issue.