I/O error on PATCH request for "http://localhost:8081/api/users/user/1". Invalid HTTP method: PATCH

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我是使用RestTemplate 类发送Http请求的，

public ResponseEntity<?> updateUser(User user, Long userId) {
RestTemplate restTemplate = new RestTemplate();
String url = "http://localhost:8081/api/users/user/1";
User usr = restTemplate.patchForObject(url, user, User.class, userId);
User usr = this.restTemplate.patchForObject(url, user, User.class);
return new ResponseEntity<User>(usr, HttpStatus.OK);
}

报错 I/O error on PATCH request for "http://localhost:8081/api/users/user/1". Invalid HTTP method: PATCH.

然后把代码修改一下：

public ResponseEntity<?> updateUser(User user, Long userId) {
RestTemplate restTemplate = new RestTemplate(new HttpComponentsClientHttpRequestFactory());
String url = "http://localhost:8081/api/users/user/1";
User usr = restTemplate.patchForObject(url, user, User.class, userId);
User usr = this.restTemplate.patchForObject(url, user, User.class);
return new ResponseEntity<User>(usr, HttpStatus.OK);
}

就好了。

注意：

需要添加依赖：

<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>

我用的是SpringBoot 所以没有加version.

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