Error Services
This is a contrived example to show how you can handle non-200 responses from Spring’s ~RestTemplate~.
The project problem-service is a simple Spring Boot app that doubles any number coming in, but every third time it sends an error back.
The project consumer has a service that calls the doubling service in problem-service and gives back the result.
Run ./gradlew bootRun in both project to run them both.
Port and Endpoint information:
| Project | Port | Endpoint | Response Status |
|---|---|---|---|
problem-service | 9090 | /someService/{value}/double | 200 or 406 |
consumer | 8080 | /myService/{value}/calculate | 200 |
Example of hitting the service in consumer
> curl -v http://localhost:8080//myService/42/calculate
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET //myService/42/calculate HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.56.1
> Accept: */*
>
< HTTP/1.1 200
< Content-Type: application/json;charset=UTF-8
< Transfer-Encoding: chunked
< Date: Wed, 29 Nov 2017 16:13:06 GMT
<
* Connection #0 to host localhost left intact
{"result":84,"error":null}%
> curl -v http://localhost:8080//myService/42/calculate
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 8080 (#0)
> GET //myService/42/calculate HTTP/1.1
> Host: localhost:8080
> User-Agent: curl/7.56.1
> Accept: */*
>
< HTTP/1.1 200
< Content-Type: application/json;charset=UTF-8
< Transfer-Encoding: chunked
< Date: Wed, 29 Nov 2017 16:13:08 GMT
<
* Connection #0 to host localhost left intact
{"result":null,"error":{"description":"Leeroy Jenkins!"}}%