[HTTPCLIENT-1456] ClientProtocolException occurs when retries after receiving 503

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.3.2
• Fix Version/s: 4.3.3, 4.4 Alpha1
• Component/s: HttpClient (classic)
• Assignee: Unassigned
• Reporter: Liu Kumai
• Created: 06/Feb/14 11:19
• Updated: 04/May/17 09:49
• Resolved: 07/Feb/14 15:17

Description

When HttpClient retries a POST request after receiving 503 (service temporary unavailable), ClientProtocolException occurs. On second request, Content-Length header is already set and the RequestContent created by HttpClientBuilder doesn't allow overriding it.

There's a workaround:

HttpClientBuilder builder = HttpClientBuilder.create();
builder.setServiceUnavailableRetryStrategy(new DefaultServiceUnavailableRetryStrategy(2, 100));
builder.addInterceptorFirst(new HttpRequestInterceptor() {
    @Override
    public void process(HttpRequest request, HttpContext context) throws HttpException, IOException {
      if (request.containsHeader(HTTP.CONTENT_LEN)) {
        request.removeHeaders(HTTP.CONTENT_LEN);
      }
    }
});

I think HttpClientBuilder should provide an option like this:

HttpClientBuilder.create()
  .setServiceUnavailableRetryStrategy(new DefaultServiceUnavailableRetryStrategy()
  .enableOverrideContentLength()
 ...