docs: protected PostMethod createPostMethod(HttpInvokerClientConfiguration config) throws IOException {
          PostMethod postMethod = new PostMethod(config.getServiceUrl());
          LocaleContext locale = LocaleContextHolder.getLocaleContext();
          if (locale != null) {
              postMethod.addRequestHeader(HTTP_HEADER_ACCEPT_LANGUAGE, StringUtils.toLanguageTag(locale.getLocale()));
          }
          if (isAcceptGzipEncoding()) {
              postMethod.addRequestHeader(HTTP_HEADER_ACCEPT_ENCODING, ENCODING_GZIP);
          }
          return postMethod;
      }