How to send POST request by Spring cloud Feign

It seems to me that Map is not valid for form body. MultiValueMap works just fine.

Feign client:

@FeignClient(name = "name", url="url", configuration = FromUrlEncodedClientConfiguration.class)
public interface PayPalFeignClient {

    @RequestMapping(value = "/", method = POST, consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    @Headers("Content-Type: application/x-www-form-urlencoded")
    String foo(MultiValueMap<String, ?> formParams);
}

Config:

@Configuration
public class FromUrlEncodedClientConfiguration {

    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    @Bean
    @Primary
    @Scope(SCOPE_PROTOTYPE)
    Encoder feignFormEncoder() {
        return new FormEncoder(new SpringEncoder(this.messageConverters));
    }
}

Gradle dependencies:

compile group: 'io.github.openfeign.form', name: 'feign-form', version: '2.0.2'
compile group: 'io.github.openfeign.form', name: 'feign-form-spring', version: '2.0.5'

After that all you have to do is call it with a MultivalueMap parameter.

First of all you should change your Feign interface like this:

@FeignClient (
    configuration = FeignSimpleEncoderConfig.class
)
public interface MpiClient {
   @RequestMapping(method = RequestMethod.POST)
   ResponseEntity<String> getPAReq(Map<String, ?> queryMap);
}

Then you should set the encoder during feign configuration:

public class FeignSimpleEncoderConfig {
    @Bean
    public Encoder encoder() {
        return new FormEncoder();
    }
}