org.springframework.web.client

## Interface RestOperations

- All Known Implementing Classes:
    RestTemplate

      public interface RestOperations

  Interface specifying a basic set of RESTful operations. Implemented by `RestTemplate`. Not often used directly, but a useful option to enhance testability, as it can easily be mocked or stubbed.
  Since:
    3.0
  Author:
    Arjen Poutsma, Juergen Hoeller
  See Also:
    `RestTemplate`

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `delete(String url, Map<String,?> uriVariables)` Delete the resources at the specified URI.
    `void` | `delete(String url, Object... uriVariables)` Delete the resources at the specified URI.
    `void` | `delete(URI url)` Delete the resources at the specified URL.
    `<T> ResponseEntity<T>` | `exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType, Map<String,?> uriVariables)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType, Object... uriVariables)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, ParameterizedTypeReference<T> responseType, Map<String,?> uriVariables)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `exchange(String url, HttpMethod method, HttpEntity<?> requestEntity, ParameterizedTypeReference<T> responseType, Object... uriVariables)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `exchange(URI url, HttpMethod method, HttpEntity<?> requestEntity, Class<T> responseType)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `exchange(URI url, HttpMethod method, HttpEntity<?> requestEntity, ParameterizedTypeReference<T> responseType)` Execute the HTTP method to the given URI template, writing the given request entity to the request, and returns the response as `ResponseEntity`.
    `<T> T` | `execute(String url, HttpMethod method, RequestCallback requestCallback, ResponseExtractor<T> responseExtractor, Map<String,?> uriVariables)` Execute the HTTP method to the given URI template, preparing the request with the `RequestCallback`, and reading the response with a `ResponseExtractor`.
    `<T> T` | `execute(String url, HttpMethod method, RequestCallback requestCallback, ResponseExtractor<T> responseExtractor, Object... uriVariables)` Execute the HTTP method to the given URI template, preparing the request with the `RequestCallback`, and reading the response with a `ResponseExtractor`.
    `<T> T` | `execute(URI url, HttpMethod method, RequestCallback requestCallback, ResponseExtractor<T> responseExtractor)` Execute the HTTP method to the given URL, preparing the request with the `RequestCallback`, and reading the response with a `ResponseExtractor`.
    `<T> ResponseEntity<T>` | `getForEntity(String url, Class<T> responseType, Map<String,?> uriVariables)` Retrieve a representation by doing a GET on the URI template.
    `<T> ResponseEntity<T>` | `getForEntity(String url, Class<T> responseType, Object... uriVariables)` Retrieve an entity by doing a GET on the specified URL.
    `<T> ResponseEntity<T>` | `getForEntity(URI url, Class<T> responseType)` Retrieve a representation by doing a GET on the URL .
    `<T> T` | `getForObject(String url, Class<T> responseType, Map<String,?> uriVariables)` Retrieve a representation by doing a GET on the URI template.
    `<T> T` | `getForObject(String url, Class<T> responseType, Object... uriVariables)` Retrieve a representation by doing a GET on the specified URL.
    `<T> T` | `getForObject(URI url, Class<T> responseType)` Retrieve a representation by doing a GET on the URL .
    `HttpHeaders` | `headForHeaders(String url, Map<String,?> uriVariables)` Retrieve all headers of the resource specified by the URI template.
    `HttpHeaders` | `headForHeaders(String url, Object... uriVariables)` Retrieve all headers of the resource specified by the URI template.
    `HttpHeaders` | `headForHeaders(URI url)` Retrieve all headers of the resource specified by the URL.
    `Set<HttpMethod>` | `optionsForAllow(String url, Map<String,?> uriVariables)` Return the value of the Allow header for the given URI.
    `Set<HttpMethod>` | `optionsForAllow(String url, Object... uriVariables)` Return the value of the Allow header for the given URI.
    `Set<HttpMethod>` | `optionsForAllow(URI url)` Return the value of the Allow header for the given URL.
    `<T> ResponseEntity<T>` | `postForEntity(String url, Object request, Class<T> responseType, Map<String,?> uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the response as `HttpEntity`.
    `<T> ResponseEntity<T>` | `postForEntity(String url, Object request, Class<T> responseType, Object... uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the response as `ResponseEntity`.
    `<T> ResponseEntity<T>` | `postForEntity(URI url, Object request, Class<T> responseType)` Create a new resource by POSTing the given object to the URL, and returns the response as `ResponseEntity`.
    `URI` | `postForLocation(String url, Object request, Map<String,?> uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the value of the `Location` header.
    `URI` | `postForLocation(String url, Object request, Object... uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the value of the `Location` header.
    `URI` | `postForLocation(URI url, Object request)` Create a new resource by POSTing the given object to the URL, and returns the value of the `Location` header.
    `<T> T` | `postForObject(String url, Object request, Class<T> responseType, Map<String,?> uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the representation found in the response.
    `<T> T` | `postForObject(String url, Object request, Class<T> responseType, Object... uriVariables)` Create a new resource by POSTing the given object to the URI template, and returns the representation found in the response.
    `<T> T` | `postForObject(URI url, Object request, Class<T> responseType)` Create a new resource by POSTing the given object to the URL, and returns the representation found in the response.
    `void` | `put(String url, Object request, Map<String,?> uriVariables)` Creates a new resource by PUTting the given object to URI template.
    `void` | `put(String url, Object request, Object... uriVariables)` Create or update a resource by PUTting the given object to the URI.
    `void` | `put(URI url, Object request)` Creates a new resource by PUTting the given object to URL.

- - ### Method Detail

    - #### getForObject

          <T> T getForObject(String url,
                           Class<T> responseType,
                           Object... uriVariables)
                         throws RestClientException

      Retrieve a representation by doing a GET on the specified URL. The response (if any) is converted and returned.

      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 converted object
      Throws:
        `RestClientException`

    - #### getForObject

          <T> T getForObject(String url,
                           Class<T> responseType,
                           Map<String,?> uriVariables)
                         throws RestClientException

      Retrieve a representation by doing a GET on the URI template. The response (if any) is converted and returned.

      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 converted object
      Throws:
        `RestClientException`

    - #### getForObject

          <T> T getForObject(URI url,
                           Class<T> responseType)
                         throws RestClientException

      Retrieve a representation by doing a GET on the URL . The response (if any) is converted and returned.
      Parameters:
        `url` - the URL
        `responseType` - the type of the return value
      Returns:
        the converted object
      Throws:
        `RestClientException`

    - #### getForEntity

          <T> ResponseEntity<T> getForEntity(String url,
                                           Class<T> responseType,
                                           Object... uriVariables)
                                         throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### getForEntity

          <T> ResponseEntity<T> getForEntity(String url,
                                           Class<T> responseType,
                                           Map<String,?> uriVariables)
                                         throws RestClientException

      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 converted object
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### getForEntity

          <T> ResponseEntity<T> getForEntity(URI url,
                                           Class<T> responseType)
                                         throws RestClientException

      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 converted object
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### headForHeaders

          HttpHeaders headForHeaders(String url,
                                   Object... uriVariables)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`

    - #### headForHeaders

          HttpHeaders headForHeaders(String url,
                                   Map<String,?> uriVariables)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`

    - #### headForHeaders

          HttpHeaders headForHeaders(URI url)
                                     throws RestClientException

      Retrieve all headers of the resource specified by the URL.
      Parameters:
        `url` - the URL
      Returns:
        all HTTP headers of that resource
      Throws:
        `RestClientException`

    - #### postForLocation

          URI postForLocation(String url,
                            Object request,
                            Object... uriVariables)
                              throws RestClientException

      Create a new resource by POSTing the given object to the URI template, and 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.

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      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
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForLocation

          URI postForLocation(String url,
                            Object request,
                            Map<String,?> uriVariables)
                              throws RestClientException

      Create a new resource by POSTing the given object to the URI template, and 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.

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      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
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForLocation

          URI postForLocation(URI url,
                            Object request)
                              throws RestClientException

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

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
      Returns:
        the value for the `Location` header
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForObject

          <T> T postForObject(String url,
                            Object request,
                            Class<T> responseType,
                            Object... uriVariables)
                          throws RestClientException

      Create a new resource by POSTing the given object to the URI template, and returns the representation found in the response.

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

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
        `responseType` - the type of the return value
        `uriVariables` - the variables to expand the template
      Returns:
        the converted object
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForObject

          <T> T postForObject(String url,
                            Object request,
                            Class<T> responseType,
                            Map<String,?> uriVariables)
                          throws RestClientException

      Create a new resource by POSTing the given object to the URI template, and returns the representation found in the response.

      URI Template variables are expanded using the given map.

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
        `responseType` - the type of the return value
        `uriVariables` - the variables to expand the template
      Returns:
        the converted object
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForObject

          <T> T postForObject(URI url,
                            Object request,
                            Class<T> responseType)
                          throws RestClientException

      Create a new resource by POSTing the given object to the URL, and returns the representation found in the response.

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
        `responseType` - the type of the return value
      Returns:
        the converted object
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### postForEntity

          <T> ResponseEntity<T> postForEntity(String url,
                                            Object request,
                                            Class<T> responseType,
                                            Object... uriVariables)
                                          throws RestClientException

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

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

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
        `uriVariables` - the variables to expand the template
      Returns:
        the converted object
      Throws:
        `RestClientException`
      Since:
        3.0.2
      See Also:
        `HttpEntity`

    - #### postForEntity

          <T> ResponseEntity<T> postForEntity(String url,
                                            Object request,
                                            Class<T> responseType,
                                            Map<String,?> uriVariables)
                                          throws RestClientException

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

      URI Template variables are expanded using the given map.

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
        `uriVariables` - the variables to expand the template
      Returns:
        the converted object
      Throws:
        `RestClientException`
      Since:
        3.0.2
      See Also:
        `HttpEntity`

    - #### postForEntity

          <T> ResponseEntity<T> postForEntity(URI url,
                                            Object request,
                                            Class<T> responseType)
                                          throws RestClientException

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

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be POSTed, may be `null`
      Returns:
        the converted object
      Throws:
        `RestClientException`
      Since:
        3.0.2
      See Also:
        `HttpEntity`

    - #### put

          void put(String url,
                 Object 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 `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      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

          void put(String url,
                 Object 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 `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      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

          void put(URI url,
                 Object request)
                   throws RestClientException

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

      The `request` parameter can be a `HttpEntity` in order to add additional HTTP headers to the request.

      Parameters:
        `url` - the URL
        `request` - the Object to be PUT, may be `null`
      Throws:
        `RestClientException`
      See Also:
        `HttpEntity`

    - #### delete

          void delete(String url,
                    Object... uriVariables)
                      throws RestClientException

      Delete the resources at the specified 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
      Throws:
        `RestClientException`

    - #### delete

          void delete(String url,
                    Map<String,?> uriVariables)
                      throws RestClientException

      Delete the resources at the specified URI.

      URI Template variables are expanded using the given map.

      Parameters:
        `url` - the URL
        `uriVariables` - the variables to expand the template
      Throws:
        `RestClientException`

    - #### delete

          void delete(URI url)
                      throws RestClientException

      Delete the resources at the specified URL.
      Parameters:
        `url` - the URL
      Throws:
        `RestClientException`

    - #### optionsForAllow

          Set<HttpMethod> optionsForAllow(String url,
                                        Object... uriVariables)
                                          throws RestClientException

      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
      Throws:
        `RestClientException`

    - #### optionsForAllow

          Set<HttpMethod> optionsForAllow(String url,
                                        Map<String,?> uriVariables)
                                          throws RestClientException

      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
      Throws:
        `RestClientException`

    - #### optionsForAllow

          Set<HttpMethod> optionsForAllow(URI url)
                                          throws RestClientException

      Return the value of the Allow header for the given URL.
      Parameters:
        `url` - the URL
      Returns:
        the value of the allow header
      Throws:
        `RestClientException`

    - #### exchange

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

      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
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### exchange

          <T> ResponseEntity<T> exchange(String url,
                                       HttpMethod method,
                                       HttpEntity<?> requestEntity,
                                       Class<T> responseType,
                                       Map<String,?> uriVariables)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### exchange

          <T> ResponseEntity<T> exchange(URI url,
                                       HttpMethod method,
                                       HttpEntity<?> requestEntity,
                                       Class<T> responseType)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.0.2

    - #### exchange

          <T> ResponseEntity<T> exchange(String url,
                                       HttpMethod method,
                                       HttpEntity<?> requestEntity,
                                       ParameterizedTypeReference<T> responseType,
                                       Object... uriVariables)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.2.0

    - #### exchange

          <T> ResponseEntity<T> exchange(String url,
                                       HttpMethod method,
                                       HttpEntity<?> requestEntity,
                                       ParameterizedTypeReference<T> responseType,
                                       Map<String,?> uriVariables)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.2.0

    - #### exchange

          <T> ResponseEntity<T> exchange(URI url,
                                       HttpMethod method,
                                       HttpEntity<?> requestEntity,
                                       ParameterizedTypeReference<T> responseType)
                                     throws RestClientException

      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
      Throws:
        `RestClientException`
      Since:
        3.2.0

    - #### execute

          <T> T execute(String url,
                      HttpMethod method,
                      RequestCallback requestCallback,
                      ResponseExtractor<T> responseExtractor,
                      Object... uriVariables)
                    throws RestClientException

      Execute the HTTP method to the given URI template, preparing the request with the `RequestCallback`, 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> T execute(String url,
                      HttpMethod method,
                      RequestCallback requestCallback,
                      ResponseExtractor<T> responseExtractor,
                      Map<String,?> uriVariables)
                    throws RestClientException

      Execute the HTTP method to the given URI template, preparing the request with the `RequestCallback`, 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> T execute(URI url,
                      HttpMethod method,
                      RequestCallback requestCallback,
                      ResponseExtractor<T> responseExtractor)
                    throws RestClientException

      Execute the HTTP method to the given URL, preparing the request with the `RequestCallback`, 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`