Java 中的 Grpc-Web 客户端

Question

I'm trying to connect to a grpc-service from a Java client. The problem is that this service is currently supporting only grpc-web over http1.1, this is because of a limitation of supporting http2 in Azure App service where the service is deployed. The grpc-java client liberary from io.grpc only supports grpc over http2 protocol, which maskes sense, and unfortenatly is not working for me.

I managed to consume a service using HTTP client from apache and okhttp3 but this works for unary calls and it didn't work for a server-side streaming service.

Is any one aware of a grpc-web java client liberary that I could use or a work arround using convenienal Http for reading grpc-web server-side streaming service.

Answer 1

If I understand your question correctly, you want a Java client for gRPC-Web so that your client can talk HTTP/1.1 through a gRPC-Web proxy (eg Envoy gRPC-Web ) because you're unable to talk HTTP/2 directly to your service because of the Azure networking limitation?

In theory this should be possible. The JavaScript implementation is because, in-browser, there's no alternative except JSON transcoding. The JavaScript implementation does implement server-side streaming, which is another requirement and confirms that this should be possible over HTTP/1.1.

However, in a quick search I found no other (ie non-JavaScript) client implementations of gRPC-Web.