使用Spring restTemplate跟随302重定向？ [英] Follow 302 redirect using Spring restTemplate?

问题描述

  RestTemplate restTemplate = new RestTemplate();

  final MappingJackson2XmlHttpMessageConverter converter = new MappingJackson2XmlHttpMessageConverter();
  final List<MediaType> supportedMediaTypes = new LinkedList<MediaType>(converter.getSupportedMediaTypes());
  supportedMediaTypes.add(MediaType.ALL);
  converter.setSupportedMediaTypes(supportedMediaTypes);
  restTemplate.getMessageConverters().add(converter);  


  ResponseEntity<MyDTO[]> response = restTemplate.getForEntity(urlBase, MyDTO[].class);

  HttpHeaders headers = response.getHeaders();
  URI location = headers.getLocation(); // Has my redirect URI

  response.getBody(); //Always null

我的印象是会自动跟踪302。这个假设我不正确吗？我现在需要选择这个位置并重新请求？

I was under the impression that a 302 would automatically be followed. Am I incorrect in this assumption? I now need to pick off this location and re-request?

推荐答案

使用默认 ClientHttpRequestFactory 实现 - 这是 SimpleClientHttpRequestFactory - 默认行为是遵循位置标题的URL（对于状态代码 3xx ） - 但仅当初始请求是 GET 请求时。

Using the default ClientHttpRequestFactory implementation - which is the SimpleClientHttpRequestFactory - the default behaviour is to follow the URL of the location header (for responses with status codes 3xx) - but only if the initial request was a GETrequest.

详细信息可在此课程中找到 - 搜索以下方法：

Details can be found in this class - searching for the following method:

protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {

    ...

    if ("GET".equals(httpMethod)) {
        connection.setInstanceFollowRedirects(true);
    }

此处的相关文档评论HttpURLConnection.setInstanceFollowRedirects 方法：

设置HTTP重定向（响应代码为3xx的请求）是否应自动跟随
这个{@code HttpURLConnection}
实例。

默认值来自followRedirects，默认为true。

Sets whether HTTP redirects (requests with response code 3xx) should be automatically followed by this {@code HttpURLConnection} instance.

The default value comes from followRedirects, which defaults to true.

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