Package org.apache.tapestry5.http.services

## Interface Response

- All Known Subinterfaces:
    `TestableResponse`
  All Known Implementing Classes:
    `ResponseImpl`, `ResponseWrapper`, `TestableResponseImpl`

      public interface Response

  API agnostic wrapper for generating a response. Bridges the gaps between the Servlet API and the Portlet API. The Response service is a shadow of the current thread's response object.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `addHeader​(String name, String value)` | Adds a response header with the given name and value, not overwriting any previous values which may have already been added.
    `void` | `disableCompression()` | Invoked to indicate that the response content is either already compressed, or is not compressable.
    `String` | `encodeRedirectURL​(String URL)` | Encodes the URL for use as a redirect, ensuring that a session id is included (if a session exists, and as necessary depending on the client browser's use of cookies).
    `String` | `encodeURL​(String URL)` | Encodes the URL, ensuring that a session id is included (if a session exists, and as necessary depending on the client browser's use of cookies).
    `OutputStream` | `getOutputStream​(String contentType)` | Returns an OutputStream to which byte-oriented output may be sent.
    `PrintWriter` | `getPrintWriter​(String contentType)` | Returns a PrintWriter object to which output may be sent.
    `boolean` | `isCommitted()` | Returns true if the response has already been sent, either as a redirect or as a stream of content.
    `void` | `sendError​(int sc, String message)` | Sends an error response to the client using the specified status.
    `void` | `sendRedirect​(String URL)` | Sends a redirect to the client.
    `void` | `sendRedirect​(Link link)` | Sends a redirect to a link.
    `void` | `setContentLength​(int length)` | Sets the length of the content body in the response; this method sets the HTTP Content-Length header.
    `void` | `setDateHeader​(String name, long date)` | Sets a response header with the given name and date-value.
    `void` | `setHeader​(String name, String value)` | Sets a response header with the given name and value.
    `void` | `setIntHeader​(String name, int value)` | Sets a response header with the given name and integer value.
    `void` | `setStatus​(int sc)` | Sets the status code for this response.

- - ### Method Detail

    - #### getPrintWriter

          PrintWriter getPrintWriter​(String contentType)
                              throws IOException

      Returns a PrintWriter object to which output may be sent. Invoking flush() on the writer will commit the output.
      Parameters:
        `contentType` - the MIME content type for the output, typically "text/html"
      Throws:
        `IOException`

    - #### getOutputStream

          OutputStream getOutputStream​(String contentType)
                                throws IOException

      Returns an OutputStream to which byte-oriented output may be sent. Invoking flush() on the stream will commit the output.
      Parameters:
        `contentType` - the MIME content type for the output, often "application/octet-stream" or "text/plain" or one of several others
      Throws:
        `IOException`

    - #### sendRedirect

          void sendRedirect​(String URL)
                     throws IOException

      Sends a redirect to the client.
      Parameters:
        `URL` - full or partial (relative) URL to send to the client
      Throws:
        `IOException`
      See Also:
        `encodeRedirectURL(String)`

    - #### sendRedirect

          void sendRedirect​(Link link)
                     throws IOException

      Sends a redirect to a link.
      Parameters:
        `link` - link to redirect to.
      Throws:
        `IOException`

    - #### setStatus

          void setStatus​(int sc)

      Sets the status code for this response. This method is used to set the return status code when there is no error (for example, for the status codes SC_OK or SC_MOVED_TEMPORARILY). If there is an error, and the caller wishes to invoke an error-page defined in the web applicaion, the `sendError` method should be used instead.
      Parameters:
        `sc` - the status code

    - #### sendError

          void sendError​(int sc,
                         String message)
                  throws IOException

      Sends an error response to the client using the specified status. The server defaults to creating the response to look like an HTML-formatted server error page containing the specified message, setting the content type to "text/html", leaving cookies and other headers unmodified. If an error-page declaration has been made for the web application corresponding to the status code passed in, it will be served back in preference to the suggested msg parameter. If the response has already been committed, this method throws an IllegalStateException. After using this method, the response should be considered to be committed and should not be written to.
      Parameters:
        `sc` - the error status code
        `message` - the descriptive message
      Throws:
        `IOException` - If an input or output exception occurs
        `IllegalStateException` - If the response was committed

    - #### setContentLength

          void setContentLength​(int length)

      Sets the length of the content body in the response; this method sets the HTTP Content-Length header.
      Parameters:
        `length` - the length of the content

    - #### setDateHeader

          void setDateHeader​(String name,
                             long date)

      Sets a response header with the given name and date-value. The date is specified in terms of milliseconds since the epoch. If the header had already been set, the new value overwrites the previous one.
      Parameters:
        `name` - the name of the header to set
        `date` - the assigned date value

    - #### setHeader

          void setHeader​(String name,
                         String value)

      Sets a response header with the given name and value. If the header had already been set, the new value overwrites the previous one.
      Parameters:
        `name` - the name of the header to set
        `value` - the assigned value

    - #### addHeader

          @IncompatibleChange(release="5.4",
                              details="Added method")
          void addHeader​(String name,
                         String value)

      Adds a response header with the given name and value, not overwriting any previous values which may have already been added.
      Parameters:
        `name` - the name of the header to add
        `value` - the assigned value
      Since:
        5.4

    - #### setIntHeader

          void setIntHeader​(String name,
                            int value)

      Sets a response header with the given name and integer value. If the header had already been set, the new value overwrites the previous one.
      Parameters:
        `name` - the name of the header to set
        `value` - the assigned integer value

    - #### encodeURL

          String encodeURL​(String URL)

      Encodes the URL, ensuring that a session id is included (if a session exists, and as necessary depending on the client browser's use of cookies).
      Parameters:
        `URL` -
      Returns:
        the same URL or a different one with additional information to track the user session

    - #### encodeRedirectURL

          String encodeRedirectURL​(String URL)

      Encodes the URL for use as a redirect, ensuring that a session id is included (if a session exists, and as necessary depending on the client browser's use of cookies).
      Parameters:
        `URL` -
      Returns:
        the same URL or a different one with additional information to track the user session

    - #### isCommitted

          boolean isCommitted()

      Returns true if the response has already been sent, either as a redirect or as a stream of content.
      Returns:
        true if response already sent

    - #### disableCompression

          void disableCompression()

      Invoked to indicate that the response content is either already compressed, or is not compressable.
      Since:
        5.2.1