org.springframework.http.HttpMethod#HEAD源码实例Demo

@Override
public void handleRequest(HttpServerExchange exchange) {
	UndertowServerHttpRequest request = null;
	try {
		request = new UndertowServerHttpRequest(exchange, getDataBufferFactory());
	}
	catch (URISyntaxException ex) {
		if (logger.isWarnEnabled()) {
			logger.debug("Failed to get request URI: " + ex.getMessage());
		}
		exchange.setStatusCode(400);
		return;
	}
	ServerHttpResponse response = new UndertowServerHttpResponse(exchange, getDataBufferFactory(), request);

	if (request.getMethod() == HttpMethod.HEAD) {
		response = new HttpHeadResponseDecorator(response);
	}

	HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber(exchange, request);
	this.httpHandler.handle(request, response).subscribe(resultSubscriber);
}
 

@Override
public void handleRequest(HttpServerExchange exchange) {
	UndertowServerHttpRequest request = null;
	try {
		request = new UndertowServerHttpRequest(exchange, getDataBufferFactory());
	}
	catch (URISyntaxException ex) {
		if (logger.isWarnEnabled()) {
			logger.debug("Failed to get request URI: " + ex.getMessage());
		}
		exchange.setStatusCode(400);
		return;
	}
	ServerHttpResponse response = new UndertowServerHttpResponse(exchange, getDataBufferFactory(), request);

	if (request.getMethod() == HttpMethod.HEAD) {
		response = new HttpHeadResponseDecorator(response);
	}

	HandlerResultSubscriber resultSubscriber = new HandlerResultSubscriber(exchange, request);
	this.httpHandler.handle(request, response).subscribe(resultSubscriber);
}
 

/**
 * Gets the HTTP method indicating the operation to perform on the resource identified in the client's HTTP request.
 * This method converts GemFire's HttpMethod enumerated value from the Link into a corresponding Spring HttpMethod
 * enumerated value.
 * <p/>
 * @return a Spring HttpMethod enumerated value indicating the operation to perform on the resource identified in the
 * client's HTTP request.
 * @see com.gemstone.gemfire.management.internal.web.http.HttpMethod
 * @see com.gemstone.gemfire.management.internal.web.domain.Link#getMethod()
 * @see org.springframework.http.HttpMethod
 * @see org.springframework.http.HttpRequest#getMethod()
 */
@Override
public HttpMethod getMethod() {
  switch (getLink().getMethod()) {
    case DELETE:
      return HttpMethod.DELETE;
    case HEAD:
      return HttpMethod.HEAD;
    case OPTIONS:
      return HttpMethod.OPTIONS;
    case POST:
      return HttpMethod.POST;
    case PUT:
      return HttpMethod.PUT;
    case TRACE:
      return HttpMethod.TRACE;
    case GET:
    default:
      return HttpMethod.GET;
  }
}
 

/**
 * Gets the HTTP method indicating the operation to perform on the resource identified in the client's HTTP request.
 * This method converts GemFire's HttpMethod enumerated value from the Link into a corresponding Spring HttpMethod
 * enumerated value.
 * <p/>
 * @return a Spring HttpMethod enumerated value indicating the operation to perform on the resource identified in the
 * client's HTTP request.
 * @see com.gemstone.gemfire.management.internal.web.http.HttpMethod
 * @see com.gemstone.gemfire.management.internal.web.domain.Link#getMethod()
 * @see org.springframework.http.HttpMethod
 * @see org.springframework.http.HttpRequest#getMethod()
 */
@Override
public HttpMethod getMethod() {
  switch (getLink().getMethod()) {
    case DELETE:
      return HttpMethod.DELETE;
    case HEAD:
      return HttpMethod.HEAD;
    case OPTIONS:
      return HttpMethod.OPTIONS;
    case POST:
      return HttpMethod.POST;
    case PUT:
      return HttpMethod.PUT;
    case TRACE:
      return HttpMethod.TRACE;
    case GET:
    default:
      return HttpMethod.GET;
  }
}
 

@Nullable
private RequestMethodsRequestCondition matchRequestMethod(String httpMethodValue) {
	HttpMethod httpMethod = HttpMethod.resolve(httpMethodValue);
	if (httpMethod != null) {
		for (RequestMethod method : getMethods()) {
			if (httpMethod.matches(method.name())) {
				return requestMethodConditionCache.get(method.name());
			}
		}
		if (httpMethod == HttpMethod.HEAD && getMethods().contains(RequestMethod.GET)) {
			return requestMethodConditionCache.get(HttpMethod.GET.name());
		}
	}
	return null;
}
 

private boolean isResourceNotModified(ServletServerHttpRequest request, ServletServerHttpResponse response) {
	ServletWebRequest servletWebRequest =
			new ServletWebRequest(request.getServletRequest(), response.getServletResponse());
	HttpHeaders responseHeaders = response.getHeaders();
	String etag = responseHeaders.getETag();
	long lastModifiedTimestamp = responseHeaders.getLastModified();
	if (request.getMethod() == HttpMethod.GET || request.getMethod() == HttpMethod.HEAD) {
		responseHeaders.remove(HttpHeaders.ETAG);
		responseHeaders.remove(HttpHeaders.LAST_MODIFIED);
	}

	return servletWebRequest.checkNotModified(etag, lastModifiedTimestamp);
}
 

@Nullable
private RequestMethodsRequestCondition matchRequestMethod(@Nullable HttpMethod httpMethod) {
	if (httpMethod != null) {
		for (RequestMethod method : getMethods()) {
			if (httpMethod.matches(method.name())) {
				return new RequestMethodsRequestCondition(method);
			}
		}
		if (httpMethod == HttpMethod.HEAD && getMethods().contains(RequestMethod.GET)) {
			return GET_CONDITION;
		}
	}
	return null;
}
 

@Test
public void givenFooService_whenCallOptionsForAllow_thenReceiveValueOfAllowHeader() {
    final Set<HttpMethod> optionsForAllow = restTemplate.optionsForAllow(fooResourceUrl);
    final HttpMethod[] supportedMethods = { HttpMethod.GET, HttpMethod.POST, HttpMethod.HEAD };

    assertTrue(optionsForAllow.containsAll(Arrays.asList(supportedMethods)));
}
 

private boolean isResourceNotModified(ServletServerHttpRequest request, ServletServerHttpResponse response) {
	ServletWebRequest servletWebRequest =
			new ServletWebRequest(request.getServletRequest(), response.getServletResponse());
	HttpHeaders responseHeaders = response.getHeaders();
	String etag = responseHeaders.getETag();
	long lastModifiedTimestamp = responseHeaders.getLastModified();
	if (request.getMethod() == HttpMethod.GET || request.getMethod() == HttpMethod.HEAD) {
		responseHeaders.remove(HttpHeaders.ETAG);
		responseHeaders.remove(HttpHeaders.LAST_MODIFIED);
	}

	return servletWebRequest.checkNotModified(etag, lastModifiedTimestamp);
}
 

private RequestMethodsRequestCondition matchRequestMethod(String httpMethodValue) {
	HttpMethod httpMethod = HttpMethod.resolve(httpMethodValue);
	if (httpMethod != null) {
		for (RequestMethod method : getMethods()) {
			if (httpMethod.matches(method.name())) {
				return new RequestMethodsRequestCondition(method);
			}
		}
		if (httpMethod == HttpMethod.HEAD && getMethods().contains(RequestMethod.GET)) {
			return GET_CONDITION;
		}
	}
	return null;
}
 

private boolean isResourceNotModified(ServletServerHttpRequest inputMessage, ServletServerHttpResponse outputMessage) {
	ServletWebRequest servletWebRequest =
			new ServletWebRequest(inputMessage.getServletRequest(), outputMessage.getServletResponse());
	HttpHeaders responseHeaders = outputMessage.getHeaders();
	String etag = responseHeaders.getETag();
	long lastModifiedTimestamp = responseHeaders.getLastModified();
	if (inputMessage.getMethod() == HttpMethod.GET || inputMessage.getMethod() == HttpMethod.HEAD) {
		responseHeaders.remove(HttpHeaders.ETAG);
		responseHeaders.remove(HttpHeaders.LAST_MODIFIED);
	}

	return servletWebRequest.checkNotModified(etag, lastModifiedTimestamp);
}
 

@Test
public void givenFooService_whenCallOptionsForAllow_thenReceiveValueOfAllowHeader() {
    final Set<HttpMethod> optionsForAllow = restTemplate.optionsForAllow(fooResourceUrl);
    final HttpMethod[] supportedMethods = { HttpMethod.GET, HttpMethod.POST, HttpMethod.HEAD };

    assertTrue(optionsForAllow.containsAll(Arrays.asList(supportedMethods)));
}
 

private ServerHttpResponse prepareResponse(ServerHttpResponse response, ServerHttpRequest request) {
	return (request.getMethod() == HttpMethod.HEAD ? new HttpHeadResponseDecorator(response) : response);
}
 

private ServerHttpResponse prepareResponse(ServerHttpResponse response, ServerHttpRequest request) {
	return (request.getMethod() == HttpMethod.HEAD ? new HttpHeadResponseDecorator(response) : response);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param urlTemplate a URL template; the resulting URL will be encoded
 * @param uriVars zero or more URI variables
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(String urlTemplate, Object... uriVars) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, urlTemplate, uriVars);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param uri the URL
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(URI uri) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, uri);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param urlTemplate a URL template; the resulting URL will be encoded
 * @param uriVars zero or more URI variables
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(String urlTemplate, Object... uriVars) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, urlTemplate, uriVars);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param uri the URL
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(URI uri) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, uri);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param urlTemplate a URL template; the resulting URL will be encoded
 * @param urlVariables zero or more URL variables
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(String urlTemplate, Object... urlVariables) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, urlTemplate, urlVariables);
}
 

/**
 * Create a {@link MockHttpServletRequestBuilder} for a HEAD request.
 * @param uri the URL
 * @since 4.1
 */
public static MockHttpServletRequestBuilder head(URI uri) {
	return new MockHttpServletRequestBuilder(HttpMethod.HEAD, uri);
}