org.springframework.web.client

Interface AsyncRestOperations

All Known Implementing Classes:

AsyncRestTemplate

public interface AsyncRestOperations

Interface specifying a basic set of asynchronous RESTful operations. Implemented by AsyncRestTemplate. Not often used directly, but a useful option to enhance testability, as it can easily be mocked or stubbed.

Since:

4.0

Author:

Arjen Poutsma

See Also:

AsyncRestTemplate, RestOperations

Method Summary

Modifier and Type	Method and Description
org.springframework.util.concurrent.ListenableFuture<?>	delete(String url, Map<String,?> uriVariables) Asynchronously delete the resources at the specified URI.
org.springframework.util.concurrent.ListenableFuture<?>	delete(String url, Object... uriVariables) Asynchronously delete the resources at the specified URI.
org.springframework.util.concurrent.ListenableFuture<?>	delete(URI url) Asynchronously delete the resources at the specified URI.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType, Map<String,?> uriVariables) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType, Object... uriVariables) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, org.springframework.core.ParameterizedTypeReference<T> responseType, Map<String,?> uriVariables) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, org.springframework.core.ParameterizedTypeReference<T> responseType, Object... uriVariables) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(URI url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	exchange(URI url, HttpMethod method, HttpEntity<?> requestEntity, org.springframework.core.ParameterizedTypeReference<T> responseType) Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<T>	execute(String url, HttpMethod method, AsyncRequestCallback requestCallback, ResponseExtractor<T> responseExtractor, Map<String,?> uriVariables) Asynchronously execute the HTTP method to the given URI template, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.
<T> org.springframework.util.concurrent.ListenableFuture<T>	execute(String url, HttpMethod method, AsyncRequestCallback requestCallback, ResponseExtractor<T> responseExtractor, Object... uriVariables) Asynchronously execute the HTTP method to the given URI template, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.
<T> org.springframework.util.concurrent.ListenableFuture<T>	execute(URI url, HttpMethod method, AsyncRequestCallback requestCallback, ResponseExtractor<T> responseExtractor) Asynchronously execute the HTTP method to the given URL, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	getForEntity(String url, Class<T> responseType, Map<String,?> uriVariables) Asynchronously retrieve a representation by doing a GET on the URI template.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	getForEntity(String url, Class<T> responseType, Object... uriVariables) Asynchronously retrieve an entity by doing a GET on the specified URL.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	getForEntity(URI url, Class<T> responseType) Asynchronously retrieve a representation by doing a GET on the URL.
RestOperations	getRestOperations() Expose the synchronous Spring RestTemplate to allow synchronous invocation.
org.springframework.util.concurrent.ListenableFuture<HttpHeaders>	headForHeaders(String url, Map<String,?> uriVariables) Asynchronously retrieve all headers of the resource specified by the URI template.
org.springframework.util.concurrent.ListenableFuture<HttpHeaders>	headForHeaders(String url, Object... uriVariables) Asynchronously retrieve all headers of the resource specified by the URI template.
org.springframework.util.concurrent.ListenableFuture<HttpHeaders>	headForHeaders(URI url) Asynchronously retrieve all headers of the resource specified by the URL.
org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>>	optionsForAllow(String url, Map<String,?> uriVariables) Asynchronously return the value of the Allow header for the given URI.
org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>>	optionsForAllow(String url, Object... uriVariables) Asynchronously return the value of the Allow header for the given URI.
org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>>	optionsForAllow(URI url) Asynchronously return the value of the Allow header for the given URL.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	postForEntity(String url, HttpEntity<?> request, Class<T> responseType, Map<String,?> uriVariables) Create a new resource by POSTing the given object to the URI template, and asynchronously returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	postForEntity(String url, HttpEntity<?> request, Class<T> responseType, Object... uriVariables) Create a new resource by POSTing the given object to the URI template, and asynchronously returns the response as ResponseEntity.
<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>>	postForEntity(URI url, HttpEntity<?> request, Class<T> responseType) Create a new resource by POSTing the given object to the URL, and asynchronously returns the response as ResponseEntity.
org.springframework.util.concurrent.ListenableFuture<URI>	postForLocation(String url, HttpEntity<?> request, Map<String,?> uriVariables) Create a new resource by POSTing the given object to the URI template, and asynchronously returns the value of the Location header.
org.springframework.util.concurrent.ListenableFuture<URI>	postForLocation(String url, HttpEntity<?> request, Object... uriVariables) Create a new resource by POSTing the given object to the URI template, and asynchronously returns the value of the Location header.
org.springframework.util.concurrent.ListenableFuture<URI>	postForLocation(URI url, HttpEntity<?> request) Create a new resource by POSTing the given object to the URL, and asynchronously returns the value of the Location header.
org.springframework.util.concurrent.ListenableFuture<?>	put(String url, HttpEntity<?> request, Map<String,?> uriVariables) Creates a new resource by PUTting the given object to URI template.
org.springframework.util.concurrent.ListenableFuture<?>	put(String url, HttpEntity<?> request, Object... uriVariables) Create or update a resource by PUTting the given object to the URI.
org.springframework.util.concurrent.ListenableFuture<?>	put(URI url, HttpEntity<?> request) Creates a new resource by PUTting the given object to URL.

Method Detail

getRestOperations

RestOperations getRestOperations()

Expose the synchronous Spring RestTemplate to allow synchronous invocation.

getForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> getForEntity(String url,
                                                                                         Class<T> responseType,
                                                                                         Object... uriVariables)
                                                                                  throws RestClientException

Asynchronously retrieve an entity by doing a GET on the specified URL. The response is converted and stored in an ResponseEntity.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

responseType - the type of the return value

uriVariables - the variables to expand the template

Returns:

the entity wrapped in a Future

Throws:

RestClientException

getForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> getForEntity(String url,
                                                                                         Class<T> responseType,
                                                                                         Map<String,?> uriVariables)
                                                                                  throws RestClientException

Asynchronously retrieve a representation by doing a GET on the URI template. The response is converted and stored in an ResponseEntity.

URI Template variables are expanded using the given map.

Parameters:

url - the URL

responseType - the type of the return value

uriVariables - the map containing variables for the URI template

Returns:

the entity wrapped in a Future

Throws:

RestClientException

getForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> getForEntity(URI url,
                                                                                         Class<T> responseType)
                                                                                  throws RestClientException

Asynchronously retrieve a representation by doing a GET on the URL. The response is converted and stored in an ResponseEntity.

Parameters:

url - the URL

responseType - the type of the return value

Returns:

the entity wrapped in a Future

Throws:

RestClientException

headForHeaders

org.springframework.util.concurrent.ListenableFuture<HttpHeaders> headForHeaders(String url,
                                                                                 Object... uriVariables)
                                                                          throws RestClientException

Asynchronously retrieve all headers of the resource specified by the URI template.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

uriVariables - the variables to expand the template

Returns:

all HTTP headers of that resource wrapped in a Future

Throws:

RestClientException

headForHeaders

org.springframework.util.concurrent.ListenableFuture<HttpHeaders> headForHeaders(String url,
                                                                                 Map<String,?> uriVariables)
                                                                          throws RestClientException

Asynchronously retrieve all headers of the resource specified by the URI template.

URI Template variables are expanded using the given map.

Parameters:

url - the URL

uriVariables - the map containing variables for the URI template

Returns:

all HTTP headers of that resource wrapped in a Future

Throws:

RestClientException

headForHeaders

org.springframework.util.concurrent.ListenableFuture<HttpHeaders> headForHeaders(URI url)
                                                                          throws RestClientException

Asynchronously retrieve all headers of the resource specified by the URL.

Parameters:

url - the URL

Returns:

all HTTP headers of that resource wrapped in a Future

Throws:

RestClientException

postForLocation

org.springframework.util.concurrent.ListenableFuture<URI> postForLocation(String url,
                                                                          HttpEntity<?> request,
                                                                          Object... uriVariables)
                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URI template, and asynchronously returns the value of the Location header. This header typically indicates where the new resource is stored.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

uriVariables - the variables to expand the template

Returns:

the value for the Location header wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

postForLocation

org.springframework.util.concurrent.ListenableFuture<URI> postForLocation(String url,
                                                                          HttpEntity<?> request,
                                                                          Map<String,?> uriVariables)
                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URI template, and asynchronously returns the value of the Location header. This header typically indicates where the new resource is stored.

URI Template variables are expanded using the given map.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

uriVariables - the variables to expand the template

Returns:

the value for the Location header wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

postForLocation

org.springframework.util.concurrent.ListenableFuture<URI> postForLocation(URI url,
                                                                          HttpEntity<?> request)
                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URL, and asynchronously returns the value of the Location header. This header typically indicates where the new resource is stored.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

Returns:

the value for the Location header wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

postForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> postForEntity(String url,
                                                                                          HttpEntity<?> request,
                                                                                          Class<T> responseType,
                                                                                          Object... uriVariables)
                                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URI template, and asynchronously returns the response as ResponseEntity.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

uriVariables - the variables to expand the template

Returns:

the entity wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

postForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> postForEntity(String url,
                                                                                          HttpEntity<?> request,
                                                                                          Class<T> responseType,
                                                                                          Map<String,?> uriVariables)
                                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URI template, and asynchronously returns the response as ResponseEntity.

URI Template variables are expanded using the given map.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

uriVariables - the variables to expand the template

Returns:

the entity wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

postForEntity

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> postForEntity(URI url,
                                                                                          HttpEntity<?> request,
                                                                                          Class<T> responseType)
                                                                                   throws RestClientException

Create a new resource by POSTing the given object to the URL, and asynchronously returns the response as ResponseEntity.

Parameters:

url - the URL

request - the Object to be POSTed (may be null)

Returns:

the entity wrapped in a Future

Throws:

RestClientException

See Also:

HttpEntity

put

org.springframework.util.concurrent.ListenableFuture<?> put(String url,
                                                            HttpEntity<?> request,
                                                            Object... uriVariables)
                                                     throws RestClientException

Create or update a resource by PUTting the given object to the URI.

URI Template variables are expanded using the given URI variables, if any.

The Future will return a null result upon completion.

Parameters:

url - the URL

request - the Object to be PUT (may be null)

uriVariables - the variables to expand the template

Throws:

RestClientException

See Also:

HttpEntity

put

org.springframework.util.concurrent.ListenableFuture<?> put(String url,
                                                            HttpEntity<?> request,
                                                            Map<String,?> uriVariables)
                                                     throws RestClientException

Creates a new resource by PUTting the given object to URI template.

URI Template variables are expanded using the given map.

The Future will return a null result upon completion.

Parameters:

url - the URL

request - the Object to be PUT (may be null)

uriVariables - the variables to expand the template

Throws:

RestClientException

See Also:

HttpEntity

put

org.springframework.util.concurrent.ListenableFuture<?> put(URI url,
                                                            HttpEntity<?> request)
                                                     throws RestClientException

Creates a new resource by PUTting the given object to URL.

The Future will return a null result upon completion.

Parameters:

url - the URL

request - the Object to be PUT (may be null)

Throws:

RestClientException

See Also:

HttpEntity

delete

org.springframework.util.concurrent.ListenableFuture<?> delete(String url,
                                                               Object... uriVariables)
                                                        throws RestClientException

Asynchronously delete the resources at the specified URI.

URI Template variables are expanded using the given URI variables, if any.

The Future will return a null result upon completion.

Parameters:

url - the URL

uriVariables - the variables to expand in the template

Throws:

RestClientException

delete

org.springframework.util.concurrent.ListenableFuture<?> delete(String url,
                                                               Map<String,?> uriVariables)
                                                        throws RestClientException

Asynchronously delete the resources at the specified URI.

URI Template variables are expanded using the given URI variables, if any.

The Future will return a null result upon completion.

Parameters:

url - the URL

uriVariables - the variables to expand in the template

Throws:

RestClientException

delete

org.springframework.util.concurrent.ListenableFuture<?> delete(URI url)
                                                        throws RestClientException

Asynchronously delete the resources at the specified URI.

URI Template variables are expanded using the given URI variables, if any.

The Future will return a null result upon completion.

Parameters:

url - the URL

Throws:

RestClientException

optionsForAllow

org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>> optionsForAllow(String url,
                                                                                      Object... uriVariables)
                                                                               throws RestClientException

Asynchronously return the value of the Allow header for the given URI.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

uriVariables - the variables to expand in the template

Returns:

the value of the allow header wrapped in a Future

Throws:

RestClientException

optionsForAllow

org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>> optionsForAllow(String url,
                                                                                      Map<String,?> uriVariables)
                                                                               throws RestClientException

Asynchronously return the value of the Allow header for the given URI.

URI Template variables are expanded using the given map.

Parameters:

url - the URL

uriVariables - the variables to expand in the template

Returns:

the value of the allow header wrapped in a Future

Throws:

RestClientException

optionsForAllow

org.springframework.util.concurrent.ListenableFuture<Set<HttpMethod>> optionsForAllow(URI url)
                                                                               throws RestClientException

Asynchronously return the value of the Allow header for the given URL.

Parameters:

url - the URL

Returns:

the value of the allow header wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(String url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     Class<T> responseType,
                                                                                     Object... uriVariables)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

uriVariables - the variables to expand in the template

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(String url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     Class<T> responseType,
                                                                                     Map<String,?> uriVariables)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

uriVariables - the variables to expand in the template

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(URI url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     Class<T> responseType)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(String url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     org.springframework.core.ParameterizedTypeReference<T> responseType,
                                                                                     Object... uriVariables)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity. The given ParameterizedTypeReference is used to pass generic type information:

 ParameterizedTypeReference<List<MyBean>> myBean = new ParameterizedTypeReference<List<MyBean>>() {};
 ResponseEntity<List<MyBean>> response = template.exchange("http://example.com",HttpMethod.GET, null, myBean);
 

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

uriVariables - the variables to expand in the template

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(String url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     org.springframework.core.ParameterizedTypeReference<T> responseType,
                                                                                     Map<String,?> uriVariables)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity. The given ParameterizedTypeReference is used to pass generic type information:

 ParameterizedTypeReference<List<MyBean>> myBean = new ParameterizedTypeReference<List<MyBean>>() {};
 ResponseEntity<List<MyBean>> response = template.exchange("http://example.com",HttpMethod.GET, null, myBean);
 

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

uriVariables - the variables to expand in the template

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

exchange

<T> org.springframework.util.concurrent.ListenableFuture<ResponseEntity<T>> exchange(URI url,
                                                                                     HttpMethod method,
                                                                                     HttpEntity<?> requestEntity,
                                                                                     org.springframework.core.ParameterizedTypeReference<T> responseType)
                                                                              throws RestClientException

Asynchronously execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as ResponseEntity. The given ParameterizedTypeReference is used to pass generic type information:

 ParameterizedTypeReference<List<MyBean>> myBean = new ParameterizedTypeReference<List<MyBean>>() {};
 ResponseEntity<List<MyBean>> response = template.exchange("http://example.com",HttpMethod.GET, null, myBean);
 

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestEntity - the entity (headers and/or body) to write to the request (may be null)

responseType - the type of the return value

Returns:

the response as entity wrapped in a Future

Throws:

RestClientException

execute

<T> org.springframework.util.concurrent.ListenableFuture<T> execute(String url,
                                                                    HttpMethod method,
                                                                    AsyncRequestCallback requestCallback,
                                                                    ResponseExtractor<T> responseExtractor,
                                                                    Object... uriVariables)
                                                             throws RestClientException

Asynchronously execute the HTTP method to the given URI template, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.

URI Template variables are expanded using the given URI variables, if any.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestCallback - object that prepares the request

responseExtractor - object that extracts the return value from the response

uriVariables - the variables to expand in the template

Returns:

an arbitrary object, as returned by the ResponseExtractor

Throws:

RestClientException

execute

<T> org.springframework.util.concurrent.ListenableFuture<T> execute(String url,
                                                                    HttpMethod method,
                                                                    AsyncRequestCallback requestCallback,
                                                                    ResponseExtractor<T> responseExtractor,
                                                                    Map<String,?> uriVariables)
                                                             throws RestClientException

Asynchronously execute the HTTP method to the given URI template, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.

URI Template variables are expanded using the given URI variables map.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestCallback - object that prepares the request

responseExtractor - object that extracts the return value from the response

uriVariables - the variables to expand in the template

Returns:

an arbitrary object, as returned by the ResponseExtractor

Throws:

RestClientException

execute

<T> org.springframework.util.concurrent.ListenableFuture<T> execute(URI url,
                                                                    HttpMethod method,
                                                                    AsyncRequestCallback requestCallback,
                                                                    ResponseExtractor<T> responseExtractor)
                                                             throws RestClientException

Asynchronously execute the HTTP method to the given URL, preparing the request with the AsyncRequestCallback, and reading the response with a ResponseExtractor.

Parameters:

url - the URL

method - the HTTP method (GET, POST, etc)

requestCallback - object that prepares the request

responseExtractor - object that extracts the return value from the response

Returns:

an arbitrary object, as returned by the ResponseExtractor

Throws:

RestClientException