spring - Wiremock 为 Spring Cloud Contract stub 运行器返回错误的内容类型

Question

我是第一次尝试 Spring-Cloud-Contract。我试图让我的客户自动发现契约(Contract) stub ，但即使我的契约(Contract)在响应中指定了“application/json”的内容类型，我从 WireMock 获得的内容类型为“application/octet” '.我做错了什么？

我的服务中有一个简单的方法，它从 /status 端点返回这样的模型:

{
  "name": string,
  "status": string
}

我的契约(Contract)是这样的:

import org.springframework.cloud.contract.spec.Contract

Contract.make {
    request {
        method('GET')
        headers {
            contentType(applicationJson())
        }
        url("/status")
    }

    response {
        status OK()
        body(
                name: "Demo",
                status: "RUNNING"
        )
        headers {
            contentType(applicationJson())
        }
    }
}

在我的客户端中，我有一个使用 Spring RestTemplate 来查询此端点的类:

@Component
public class StatusClient {

    private final RestTemplate restTemplate;

    public StatusClient(RestTemplate restTemplate) {
        this.restTemplate = restTemplate;
    }

    public Status getStatus() {
        return this.restTemplate
                .exchange("http://localhost:8080/status", HttpMethod.GET, null, Status.class)
                .getBody();
    }
}

@Data
class Status implements Serializable {
    private String name;
    private String status;
}

我的单元测试使用 @AutoConfigureStubRunner 从本地存储库中提取最新版本的合约，并对来自合约的响应进行断言(例如名称 = Demo，状态 = RUNNING)。

@RunWith(SpringRunner.class)
@SpringBootTest
@AutoConfigureStubRunner(ids = {"com.example:contract-demo:+:8080"}, stubsMode = StubRunnerProperties.StubsMode.LOCAL)
public class StatusClientTests {

    @Autowired
    private StatusClient client;

    @Test
    public void testThatStatusReturnsSuccessfully() {
        Status result = this.client.getStatus();
        assertEquals("Demo", result.getName());
        assertEquals("RUNNING", result.getStatus());
    }
}

当我运行测试时，WireMock 报告它按预期收到的契约(Contract):

2018-05-31 11:36:49.919  INFO 14212 --- [tp1255723887-26] WireMock                                 : Request received:
127.0.0.1 - GET /status

User-Agent: [Java/1.8.0_161]
Connection: [keep-alive]
Host: [localhost:8080]
Accept: [application/json, application/*+json]



Matched response definition:
{
  "status" : 200,
  "body" : "{\"name\":\"Demo\",\"status\":\"RUNNING\"}",
  "headers" : {
    "contentType" : "application/json"
  },
  "transformers" : [ "response-template" ]
}

Response:
HTTP/1.1 200
contentType: [application/json]

但是当 RestTemplate 尝试反序列化它时，它会抛出异常，因为一旦它命中提取数据的方法，响应内容类型实际上是“application/octet”:

org.springframework.web.client.RestClientException: Could not extract response: no suitable HttpMessageConverter found for response type [class com.example.contractclientdemo.Status] and content type [application/octet-stream]

    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:119)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:991)
    at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:974)
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:725)
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:680)
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:600)
    at com.example.contractclientdemo.StatusClient.getStatus(StatusClient.java:18)

我正在为 Spring 云版本使用 Finchley.RC2，并且 spring-cloud-starter-contract-stub-runner 是我除了 spring-boot-starter 之外唯一的测试依赖项-测试。

我知道 WireMock 返回了错误的内容类型，因为我深入调试了 Spring 中的 HttpMessageConverterExtractor 类，这就是 getContentType 方法在查询时返回的内容。

为什么 WireMock 返回错误的内容类型，尽管它在日志中报告了正确的内容类型？我怎样才能让它正确返回一个 application/json 以便我可以反序列化我的简单消息？

Answer 1

我遇到了和你完全一样的问题。我通过添加

解决了它

headers {
  header 'Content-Type': 'application/json;charset=UTF-8'
}

响应。您的回复中似乎有，虽然是以另一种方式写的，但这确实解决了我的问题。所以这与它有关。

在进行更改之前，curl 显示没有 Content-Type 响应 header :

curl -v -H "Accept: application/json" localhost:6565/products/ABC
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 6565 (#0)
GET /products/ABC HTTP/1.1
Host: localhost:6565
User-Agent: curl/7.58.0
Accept:application/json

HTTP/1.1 200 OK
Transfer-Encoding: chunked
Server: Jetty(9.2.z-SNAPSHOT)

Connection #0 to host localhost left intact

{  
  "price": {  
    "currencyCode": "EUR",  
    "value": "100.50"  
  },  
  "name": "Fake product"  
}

完成更改后，curl 返回了这个并且 RestTemplate 设法反序列化了它。

HTTP/1.1 200 OK
Content-Type: application/json;charset=UTF-8
Transfer-Encoding: chunked
Server: Jetty(9.2.z-SNAPSHOT)

这是我的工作契约(Contract):

import org.springframework.cloud.contract.spec.Contract
Contract.make {
    description "should return product information"
    request{
        method GET()
        url("/products/ABC")
    }
    response {
        status 200
        headers {
            header 'Content-Type': 'application/json;charset=UTF-8'
    }
        body([
          name: 'Fake product',
          price:[
              currencyCode: 'EUR',
              value: 100.50
          ]
        ])
    }
}

希望对你有帮助