Examples of org.springframework.http.HttpHeaders

org.springframework.http.HttpHeaders
Represents HTTP request and response headers, mapping string header names to list of string values.
In addition to the normal methods defined by {@link Map}, this class offers the following convenience methods:
- {@link #getFirst(String)} returns the first value associated with a given header name
- {@link #add(String,String)} adds a header value to the list of values for a header name
- {@link #set(String,String)} sets the header value to a single string value
Inspired by {@link com.sun.net.httpserver.Headers}. @author Arjen Poutsma @since 3.0

      MissingServletRequestPartException.class,
      BindException.class
    })
  public final ResponseEntity<Object> handleException(Exception ex, WebRequest request) {


    HttpHeaders headers = new HttpHeaders();


    if (ex instanceof NoSuchRequestHandlingMethodException) {
      HttpStatus status = HttpStatus.NOT_FOUND;
      return handleNoSuchRequestHandlingMethod((NoSuchRequestHandlingMethodException) ex, headers, status, request);
    }

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    HttpEntity<?> responseEntity = (HttpEntity<?>) returnValue;
    if (responseEntity instanceof ResponseEntity) {
      outputMessage.setStatusCode(((ResponseEntity<?>) responseEntity).getStatusCode());
    }


    HttpHeaders entityHeaders = responseEntity.getHeaders();
    if (!entityHeaders.isEmpty()) {
      outputMessage.getHeaders().putAll(entityHeaders);
    }


    Object body = responseEntity.getBody();
    if (body != null) {

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      HttpInputMessage inputMessage = createHttpInputMessage(webRequest);
      HttpOutputMessage outputMessage = createHttpOutputMessage(webRequest);
      if (responseEntity instanceof ResponseEntity && outputMessage instanceof ServerHttpResponse) {
        ((ServerHttpResponse) outputMessage).setStatusCode(((ResponseEntity) responseEntity).getStatusCode());
      }
      HttpHeaders entityHeaders = responseEntity.getHeaders();
      if (!entityHeaders.isEmpty()) {
        outputMessage.getHeaders().putAll(entityHeaders);
      }
      Object body = responseEntity.getBody();
      if (body != null) {
        writeWithMessageConverters(body, inputMessage, outputMessage);

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      HttpInputMessage inputMessage = createHttpInputMessage(webRequest);
      HttpOutputMessage outputMessage = createHttpOutputMessage(webRequest);
      if (responseEntity instanceof ResponseEntity && outputMessage instanceof ServerHttpResponse) {
        ((ServerHttpResponse) outputMessage).setStatusCode(((ResponseEntity) responseEntity).getStatusCode());
      }
      HttpHeaders entityHeaders = responseEntity.getHeaders();
      if (!entityHeaders.isEmpty()) {
        outputMessage.getHeaders().putAll(entityHeaders);
      }
      Object body = responseEntity.getBody();
      if (body != null) {
        writeWithMessageConverters(body, inputMessage, outputMessage);

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                    if(StringUtils.isNotEmpty(filename) 
                            && StringUtils.isNotEmpty(filePath)){
                        Path path = Paths.get(filePath);
                        byte[] contents = Files.readAllBytes(path);
                        
                        HttpHeaders headers = new HttpHeaders();
                        headers.setContentType(MediaType.parseMediaType("application/pdf"));
                        headers.setContentDispositionFormData(filename, filename);
                        headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
                        ResponseEntity<byte[]> response = new ResponseEntity<byte[]>(contents, headers, HttpStatus.OK);
                        return response;
                    }
                }
            }

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        @Override
        @SuppressWarnings("unchecked")
        public void doWithRequest(ClientHttpRequest httpRequest) throws IOException {
            super.doWithRequest(httpRequest);
            if (!requestEntity.hasBody()) {
                HttpHeaders httpHeaders = httpRequest.getHeaders();
                HttpHeaders requestHeaders = requestEntity.getHeaders();
                if (!requestHeaders.isEmpty()) {
                    httpHeaders.putAll(requestHeaders);
                }
                if (httpHeaders.getContentLength() == -1) {
                    httpHeaders.setContentLength(0L);
                }
            } else {
                Object requestBody = requestEntity.getBody();
                Class<?> requestType = requestBody.getClass();
                HttpHeaders requestHeaders = requestEntity.getHeaders();
                MediaType requestContentType = requestHeaders.getContentType();
                for (HttpMessageConverter messageConverter : client.getRestTemplate().getMessageConverters()) {
                    if (messageConverter.canWrite(requestType, requestContentType)) {
                        if (!requestHeaders.isEmpty()) {
                            httpRequest.getHeaders().putAll(requestHeaders);
                        }
                        if (logger.isDebugEnabled()) {
                            if (requestContentType != null) {
                                logger.debug("Writing [" + requestBody + "] as \"" + requestContentType + "\" using ["

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            // nothing here
        } finally {
          fis.close();
        }


      HttpHeaders responseHeaders = httpHeaderAttachment("TEST-" + fileName,  MimeType.PNG,
        bos.size());
    return new ResponseEntity<byte[]>(bos.toByteArray(),
        responseHeaders, HttpStatus.OK);
  }

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   * Util methods
   */


  public static HttpHeaders httpHeaderAttachment(final String filename,
      final MimeType mime, final int fileSize) {
    HttpHeaders responseHeaders = new HttpHeaders();
    responseHeaders.set("charset", "utf-8");
    responseHeaders
        .setContentType(MediaType.parseMediaType(mime.getType()));
    responseHeaders.setContentLength(fileSize);
    responseHeaders.set("Content-disposition", "attachment; filename=\""
        + filename + "." + mime.name().toLowerCase() + "\"");
    return responseHeaders;
  }

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    GetProjectDetailsRequest request = new GetProjectDetailsRequest();


    request.setProjectUri(projectUri);


    HttpHeaders headers = new HttpHeaders();


    headers.setContentType(MediaType.APPLICATION_JSON);


    RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory);


    ResponseEntity<Response<Project>> response = null;
    HttpEntity<String> httpEntity = new HttpEntity<String>(

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    dateRange.setEndDate(DateUtil.translateDate(endDate));


    request.setResourceUri(resourceUri);
    request.setDateRange(dateRange);


    HttpHeaders headers = new HttpHeaders();


    headers.setContentType(MediaType.APPLICATION_JSON);


    RestTemplate restTemplate = new RestTemplate(clientHttpRequestFactory);


    ResponseEntity<Response<GetResourceAllocationSummaryResponse>> response = null;
    HttpEntity<String> httpEntity = new HttpEntity<String>(

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