Examples of com.google.api.client.http.EmptyContent

com.google.api.client.http.EmptyContent
Empty HTTP content of length zero just to force {@link HttpRequest#execute()} to add the header{@code Content-Length: 0}.
Note that there is no {@code Content-Length} header if the HTTP request content is {@code null} .However, when making a request like PUT or POST without a {@code Content-Length} header, someservers may respond with a {@code 411 Length Required} error. Specifying the{@code Content-Length: 0} header may work around that problem.
@since 1.11 @author Yaniv Inbar

      HttpMethod method = request.getMethod();
      request.setMethod(HttpMethod.POST);
      request.getHeaders().set("X-HTTP-Method-Override", method.name());
      // Google servers will fail to process a POST unless the Content-Length header is specified
      if (request.getContent() == null) {
        request.setContent(new EmptyContent());
      }
    }
  }

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      throws IOException {
    HttpRequest httpRequest = super.buildHttpRequest(method, url, body);
    new MethodOverride().intercept(httpRequest);
    // custom methods may use POST with no content but require a Content-Length header
    if (body == null && method.equals(HttpMethod.POST)) {
      httpRequest.setContent(new EmptyContent());
    }
    return httpRequest;
  }

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   */
  private HttpResponse executeUploadInitiation(GenericUrl initiationRequestUrl) throws IOException {
    updateStateAndNotifyListener(UploadState.INITIATION_STARTED);


    initiationRequestUrl.put("uploadType", "resumable");
    HttpContent content = metadata == null ? new EmptyContent() : metadata;
    HttpRequest request =
        requestFactory.buildRequest(initiationMethod, initiationRequestUrl, content);
    addMethodOverride(request);
    initiationHeaders.setUploadContentType(mediaContent.getType());
    initiationHeaders.setUploadContentLength(getMediaContentLength());

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  @Override
  public void clearCache(final String name) {
    try {


      final CacheResponse response = objectMapper.readValue(
          requestFactory.buildPostRequest(new ClearCacheUrl(hostName, projectId, name), new EmptyContent())
              .execute().getContent(), CacheResponse.class);


      validate(response, "cleared");


      log.debug("Successful request to clear to cache {}", name);

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   */
  private HttpResponse executeUploadInitiation(GenericUrl initiationRequestUrl) throws IOException {
    updateStateAndNotifyListener(UploadState.INITIATION_STARTED);


    initiationRequestUrl.put("uploadType", "resumable");
    HttpContent content = metadata == null ? new EmptyContent() : metadata;
    HttpRequest request =
        requestFactory.buildRequest(initiationRequestMethod, initiationRequestUrl, content);
    initiationHeaders.set(CONTENT_TYPE_HEADER, mediaContent.getType());
    if (isMediaLengthKnown()) {
      initiationHeaders.set(CONTENT_LENGTH_HEADER, getMediaContentLength());

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  @Beta
  void serverErrorCallback() throws IOException {
    Preconditions.checkNotNull(currentRequest, "The current request should not be null");


    // Query the current status of the upload by issuing an empty PUT request on the upload URI.
    currentRequest.setContent(new EmptyContent());
    currentRequest.getHeaders()
        .setContentRange("bytes */" + (isMediaLengthKnown() ? getMediaContentLength() : "*"));
  }

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