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## org.springframework.remoting.httpinvoker
Class CommonsHttpInvokerRequestExecutor

    java.lang.Object
      org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor
          org.springframework.remoting.httpinvoker.CommonsHttpInvokerRequestExecutor

All Implemented Interfaces:
  BeanClassLoaderAware, HttpInvokerRequestExecutor

    public class CommonsHttpInvokerRequestExecutor

extends AbstractHttpInvokerRequestExecutor

`HttpInvokerRequestExecutor` implementation that uses Jakarta Commons HttpClient to execute POST requests. Requires Commons HttpClient 3.0 or higher.

Allows to use a pre-configured `HttpClient` instance, potentially with authentication, HTTP connection pooling, etc. Also designed for easy subclassing, providing specific template methods.

Since:
  1.1
Author:
  Juergen Hoeller, Mark Fisher
See Also:
  `SimpleHttpInvokerRequestExecutor`

Field Summary

Fields inherited from class org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor
`CONTENT_TYPE_SERIALIZED_OBJECT, ENCODING_GZIP, HTTP_HEADER_ACCEPT_ENCODING, HTTP_HEADER_CONTENT_ENCODING, HTTP_HEADER_CONTENT_LENGTH, HTTP_HEADER_CONTENT_TYPE, HTTP_METHOD_POST, logger`

Constructor Summary
`CommonsHttpInvokerRequestExecutor()` Create a new CommonsHttpInvokerRequestExecutor with a default HttpClient that uses a default MultiThreadedHttpConnectionManager.
`CommonsHttpInvokerRequestExecutor(HttpClient httpClient)` Create a new CommonsHttpInvokerRequestExecutor with the given HttpClient instance.

Method Summary
`protected PostMethod` | `createPostMethod(HttpInvokerClientConfiguration config)` Create a PostMethod for the given configuration.
`protected RemoteInvocationResult` | `doExecuteRequest(HttpInvokerClientConfiguration config, ByteArrayOutputStream baos)` Execute the given request through Commons HttpClient.
`protected void` | `executePostMethod(HttpInvokerClientConfiguration config, HttpClient httpClient, PostMethod postMethod)` Execute the given PostMethod instance.
`HttpClient` | `getHttpClient()` Return the HttpClient instance that this request executor uses.
`protected InputStream` | `getResponseBody(HttpInvokerClientConfiguration config, PostMethod postMethod)` Extract the response body from the given executed remote invocation request.
`protected boolean` | `isGzipResponse(PostMethod postMethod)` Determine whether the given response indicates a GZIP response.
`void` | `setHttpClient(HttpClient httpClient)` Set the HttpClient instance to use for this request executor.
`void` | `setReadTimeout(int timeout)` Set the socket read timeout for the underlying HttpClient.
`protected void` | `setRequestBody(HttpInvokerClientConfiguration config, PostMethod postMethod, ByteArrayOutputStream baos)` Set the given serialized remote invocation as request body.
`protected void` | `validateResponse(HttpInvokerClientConfiguration config, PostMethod postMethod)` Validate the given response as contained in the PostMethod object, throwing an exception if it does not correspond to a successful HTTP response.

Methods inherited from class org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor
`createObjectInputStream, decorateInputStream, decorateOutputStream, doReadRemoteInvocationResult, doWriteRemoteInvocation, executeRequest, getBeanClassLoader, getByteArrayOutputStream, getContentType, isAcceptGzipEncoding, readRemoteInvocationResult, setAcceptGzipEncoding, setBeanClassLoader, setContentType, writeRemoteInvocation`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### CommonsHttpInvokerRequestExecutor

    public CommonsHttpInvokerRequestExecutor()

  Create a new CommonsHttpInvokerRequestExecutor with a default HttpClient that uses a default MultiThreadedHttpConnectionManager. Sets the socket read timeout to `DEFAULT_READ_TIMEOUT_MILLISECONDS`.

  See Also:
    `HttpClient`, `MultiThreadedHttpConnectionManager`

### CommonsHttpInvokerRequestExecutor

    public CommonsHttpInvokerRequestExecutor(HttpClient httpClient)

  Create a new CommonsHttpInvokerRequestExecutor with the given HttpClient instance. The socket read timeout of the provided HttpClient will not be changed.

  Parameters:
    `httpClient` - the HttpClient instance to use for this request executor

Method Detail

### setHttpClient

    public void setHttpClient(HttpClient httpClient)

  Set the HttpClient instance to use for this request executor.

### getHttpClient

    public HttpClient getHttpClient()

  Return the HttpClient instance that this request executor uses.

### setReadTimeout

    public void setReadTimeout(int timeout)

  Set the socket read timeout for the underlying HttpClient. A value of 0 means never timeout.

  Parameters:
    `timeout` - the timeout value in milliseconds
  See Also:
    `HttpConnectionParams.setSoTimeout(int)`, `DEFAULT_READ_TIMEOUT_MILLISECONDS`

### doExecuteRequest

    protected RemoteInvocationResult doExecuteRequest(HttpInvokerClientConfiguration config,
                                                      ByteArrayOutputStream baos)
                                               throws IOException,
                                                      ClassNotFoundException

  Execute the given request through Commons HttpClient.

  This method implements the basic processing workflow: The actual work happens in this class's template methods.

  Specified by:
    `doExecuteRequest` in class `AbstractHttpInvokerRequestExecutor`
  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
    `baos` - the ByteArrayOutputStream that contains the serialized RemoteInvocation object
  Returns:
    the RemoteInvocationResult object
  Throws:
    `IOException` - if thrown by I/O operations
    `ClassNotFoundException` - if thrown during deserialization
  See Also:
    `createPostMethod(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration)`, `setRequestBody(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, org.apache.commons.httpclient.methods.PostMethod, java.io.ByteArrayOutputStream)`, `executePostMethod(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, org.apache.commons.httpclient.HttpClient, org.apache.commons.httpclient.methods.PostMethod)`, `validateResponse(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, org.apache.commons.httpclient.methods.PostMethod)`, `getResponseBody(org.springframework.remoting.httpinvoker.HttpInvokerClientConfiguration, org.apache.commons.httpclient.methods.PostMethod)`

### createPostMethod

    protected PostMethod createPostMethod(HttpInvokerClientConfiguration config)
                                   throws IOException

  Create a PostMethod for the given configuration.

  The default implementation creates a standard PostMethod with "application/x-java-serialized-object" as "Content-Type" header.

  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
  Returns:
    the PostMethod instance
  Throws:
    `IOException` - if thrown by I/O methods

### setRequestBody

    protected void setRequestBody(HttpInvokerClientConfiguration config,
                                  PostMethod postMethod,
                                  ByteArrayOutputStream baos)
                           throws IOException

  Set the given serialized remote invocation as request body.

  The default implementation simply sets the serialized invocation as the PostMethod's request body. This can be overridden, for example, to write a specific encoding and potentially set appropriate HTTP request headers.

  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
    `postMethod` - the PostMethod to set the request body on
    `baos` - the ByteArrayOutputStream that contains the serialized RemoteInvocation object
  Throws:
    `IOException` - if thrown by I/O methods
  See Also:
    `EntityEnclosingMethod.setRequestBody(java.io.InputStream)`, `EntityEnclosingMethod.setRequestEntity(org.apache.commons.httpclient.methods.RequestEntity)`, `InputStreamRequestEntity`

### executePostMethod

    protected void executePostMethod(HttpInvokerClientConfiguration config,
                                     HttpClient httpClient,
                                     PostMethod postMethod)
                              throws IOException

  Execute the given PostMethod instance.

  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
    `httpClient` - the HttpClient to execute on
    `postMethod` - the PostMethod to execute
  Throws:
    `IOException` - if thrown by I/O methods
  See Also:
    `HttpClient.executeMethod(org.apache.commons.httpclient.HttpMethod)`

### validateResponse

    protected void validateResponse(HttpInvokerClientConfiguration config,
                                    PostMethod postMethod)
                             throws IOException

  Validate the given response as contained in the PostMethod object, throwing an exception if it does not correspond to a successful HTTP response.

  Default implementation rejects any HTTP status code beyond 2xx, to avoid parsing the response body and trying to deserialize from a corrupted stream.

  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
    `postMethod` - the executed PostMethod to validate
  Throws:
    `IOException` - if validation failed
  See Also:
    `HttpMethodBase.getStatusCode()`, `HttpException`

### getResponseBody

    protected InputStream getResponseBody(HttpInvokerClientConfiguration config,
                                          PostMethod postMethod)
                                   throws IOException

  Extract the response body from the given executed remote invocation request.

  The default implementation simply fetches the PostMethod's response body stream. If the response is recognized as GZIP response, the InputStream will get wrapped in a GZIPInputStream.

  Parameters:
    `config` - the HTTP invoker configuration that specifies the target service
    `postMethod` - the PostMethod to read the response body from
  Returns:
    an InputStream for the response body
  Throws:
    `IOException` - if thrown by I/O methods
  See Also:
    `isGzipResponse(org.apache.commons.httpclient.methods.PostMethod)`, `GZIPInputStream`, `HttpMethodBase.getResponseBodyAsStream()`, `HttpMethodBase.getResponseHeader(String)`

### isGzipResponse

    protected boolean isGzipResponse(PostMethod postMethod)

  Determine whether the given response indicates a GZIP response.

  Default implementation checks whether the HTTP "Content-Encoding" header contains "gzip" (in any casing).

  Parameters:
    `postMethod` - the PostMethod to check
  Returns:
    whether the given response indicates a GZIP response

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