why using curl as client can not call hello function in example-service server

[tomarock]

I using command: curl -X POST -H "Content-Type: application/json" -d '{"jsonrpc":"2.0","method":"hello","params":["YourName"],"id":1}' http://localhost:8080 for test but it dose not return response

[tikue]

Hi! Can you share your server code?

[tomarock]

Hi tikue!
I run example in this repo: https://github.com/google/tarpc/tree/master/example-service

[tikue]

Ah ok, try using RUST_LOG=debug to get more verbose logging. But I think the problem is that the curl command you used sends an HTTP request that looks like this:

POST / HTTP/1.1
Host: localhost:8888
User-Agent: curl/8.7.1
Accept: */*
Content-Type: application/json
Content-Length: 63

{"jsonrpc":"2.0","method":"hello","params":["YourName"],"id":1}

But the server binary in example-service does not use HTTP at all. The request you need to send looks something like this:

{"Request":{"context":{"deadline":{"secs":9,"nanos":999699542},"trace_context":{"trace_id":[8,170,113,216,215,155,43,44,255,165,13,120,158,242,13,97],"span_id":7845148348690344672,"sampling_decision":"Unampled"}},"id":0,"message":{"Hello":{"name":"YourName"}}}}

You can test the expected payload by listening on a TCP port and printing out the received stream (nc -l localhost 8888 or something) and then using cargo run --bin client to send a request to the port.