Echo Demo not Working

Hey there, a couple of us in our office have recently followed the directions in INSTALL.md and the net/grpc/gateway/examples/echo/README.md.

After following the instructions without any visible errors, we can confirm that the docker instances are all running as expected:

CONTAINER ID        IMAGE                    COMMAND                  CREATED                  STATUS              PORTS                               NAMES
d70c3b126c95        grpcweb/closure-client   "nginx"                  Less than a second ago   Up 2 seconds        0.0.0.0:8081->8081/tcp              modest_bohr
930f5ebfbbb6        grpcweb/envoy            "/usr/bin/dumb-init …"   57 seconds ago           Up About a minute   0.0.0.0:8080->8080/tcp, 10000/tcp   eloquent_heisenberg
7dd1c9f8ce1f        grpcweb/echo-server      "/github/grpc-web/ne…"   3 minutes ago            Up 3 minutes        0.0.0.0:9090->9090/tcp              echo-server

However, when running http://localhost:8080/net/grpc/gateway/examples/echo/echotest.html in the browser, we get:

upstream connect error or disconnect/reset before headers

We have also attempted to hook up our own GRPC service and a custom Envoy container with a HTTP-GRPC proxy and are getting the exact same error for any validly formatted POST request we send to the envoy proxy.

This is a complete blocker for us at this time. Any ideas?

EDIT: Discovered the echo README.md documentation is wrong, the browser URL should be:

http://localhost:8081/echotest.html

However, this also breaks as it can’t load the main.js file and I now get this error:

GET http://localhost:8081/dist/main.js net::ERR_ABORTED 404 (Not Found)

[oswee]

I see this is closed, but actually the same issue there when following - https://github.com/grpc/grpc-web/tree/master/net/grpc/gateway/examples/helloworld guide. Just reporting.

[stanley-cheung]

Closing this. Original issue was resolved. Added a blurb on how to compile the protoc-gen-grpc-web plugin here: https://github.com/grpc/grpc-web#code-generator-plugin