Package org.exoplatform.common.http.client

Class HTTPResponse

java.lang.Object
org.exoplatform.common.http.client.HTTPResponse
All Implemented Interfaces:
HTTPClientModuleConstants
public class HTTPResponse extends Object implements HTTPClientModuleConstants
This defines the http-response class returned by the requests. It's basically a wrapper around the Response class which first lets all the modules handle the response before finally giving the info to the user.
Since:
0.3
Version:
0.3-3 06/05/2001
Author:
Ronald Tschal�r

  • Method Details

    • getStatusCode

      public final int getStatusCode() throws IOException, ModuleException
      Give the status code for this request. These are grouped as follows:
      • 1xx - Informational (new in HTTP/1.1)
      • 2xx - Success
      • 3xx - Redirection
      • 4xx - Client Error
      • 5xx - Server Error
      Throws:
      IOException - if any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getReasonLine

      public final String getReasonLine() throws IOException, ModuleException
      Give the reason line associated with the status code.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getVersion

      public final String getVersion() throws IOException, ModuleException
      Get the HTTP version used for the response.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getServer

      public final String getServer() throws IOException, ModuleException
      Deprecated.
      This method is a remnant of V0.1; use getHeader("Server") instead.
      Get the name and type of server.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.
      See Also:

    • getOriginalURI

      public final URI getOriginalURI()
      Get the original URI used in the request.
      Returns:
      the URI used in primary request

    • getEffectiveURL

      public final URL getEffectiveURL() throws IOException, ModuleException
      Deprecated.
      use getEffectiveURI() instead
      Get the final URL of the document. This is set if the original request was deferred via the "moved" (301, 302, or 303) return status.
      Returns:
      the effective URL, or null if no redirection occured
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.
      See Also:

    • getEffectiveURI

      public final URI getEffectiveURI() throws IOException, ModuleException
      Get the final URI of the document. If the request was redirected via the "moved" (301, 302, 303, or 307) return status this returns the URI used in the last redirection; otherwise it returns the original URI.
      Returns:
      the effective URI
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getHeader

      public String getHeader(String hdr) throws IOException, ModuleException
      Retrieves the value for a given header.
      Parameters:
      hdr - the header name.
      Returns:
      the value for the header, or null if non-existent.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getHeaderAsInt

      public int getHeaderAsInt(String hdr) throws IOException, ModuleException, NumberFormatException
      Retrieves the value for a given header. The value is parsed as an int.
      Parameters:
      hdr - the header name.
      Returns:
      the value for the header if the header exists
      Throws:
      NumberFormatException - if the header's value is not a number or if the header does not exist.
      IOException - if any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getHeaderAsDate

      public Date getHeaderAsDate(String hdr) throws IOException, IllegalArgumentException, ModuleException
      Retrieves the value for a given header. The value is parsed as a date; if this fails it is parsed as a long representing the number of seconds since 12:00 AM, Jan 1st, 1970. If this also fails an exception is thrown.
      Note: When sending dates use Util.httpDate().
      Parameters:
      hdr - the header name.
      Returns:
      the value for the header, or null if non-existent.
      Throws:
      IllegalArgumentException - if the header's value is neither a legal date nor a number.
      IOException - if any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • listHeaders

      public Enumeration listHeaders() throws IOException, ModuleException
      Returns an enumeration of all the headers available via getHeader().
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getTrailer

      public String getTrailer(String trailer) throws IOException, ModuleException
      Retrieves the value for a given trailer. This should not be invoked until all response data has been read. If invoked before it will call getData() to force the data to be read.
      Parameters:
      trailer - the trailer name.
      Returns:
      the value for the trailer, or null if non-existent.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.
      See Also:

    • getTrailerAsInt

      public int getTrailerAsInt(String trailer) throws IOException, ModuleException, NumberFormatException
      Retrieves the value for a given tailer. The value is parsed as an int.
      Parameters:
      trailer - the tailer name.
      Returns:
      the value for the trailer if the trailer exists
      Throws:
      NumberFormatException - if the trailer's value is not a number or if the trailer does not exist.
      IOException - if any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getTrailerAsDate

      public Date getTrailerAsDate(String trailer) throws IOException, IllegalArgumentException, ModuleException
      Retrieves the value for a given trailer. The value is parsed as a date; if this fails it is parsed as a long representing the number of seconds since 12:00 AM, Jan 1st, 1970. If this also fails an IllegalArgumentException is thrown.
      Note: When sending dates use Util.httpDate().
      Parameters:
      trailer - the trailer name.
      Returns:
      the value for the trailer, or null if non-existent.
      Throws:
      IllegalArgumentException - if the trailer's value is neither a legal date nor a number.
      IOException - if any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • listTrailers

      public Enumeration listTrailers() throws IOException, ModuleException
      Returns an enumeration of all the trailers available via getTrailer().
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • getData

      public byte[] getData() throws IOException, ModuleException
      Reads all the response data into a byte array. Note that this method won't return until all the data has been received (so for instance don't invoke this method if the server is doing a server push). If getInputStream() had been previously invoked then this method only returns any unread data remaining on the stream and then closes it.

      Note to the unwary: code like 

       System.out.println("The data: " + resp.getData())
      will probably not do what you want - use 
       System.out.println("The data: " + resp.getText())
      instead.
      Returns:
      an array containing the data (body) returned. If no data was returned then it's set to a zero-length array.
      Throws:
      IOException - If any io exception occured while reading the data
      ModuleException - if any module encounters an exception.
      See Also:

    • getText

      public String getText() throws IOException, ModuleException, ParseException
      Reads all the response data into a buffer and turns it into a string using the appropriate character converter. Since this uses getData(), the caveats of that method apply here as well.
      Returns:
      the body as a String. If no data was returned then an empty string is returned.
      Throws:
      IOException - If any io exception occured while reading the data, or if the content is not text
      ModuleException - if any module encounters an exception.
      ParseException - if an error occured trying to parse the content-type header field
      See Also:

    • getInputStream

      public InputStream getInputStream() throws IOException, ModuleException
      Gets an input stream from which the returned data can be read. Note that if getData() had been previously invoked it will actually return a ByteArrayInputStream created from that data.
      Returns:
      the InputStream.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.
      See Also:

    • retryRequest

      public boolean retryRequest() throws IOException, ModuleException
      Should the request be retried by the application? If the application used an HttpOutputStream in the request then various modules (such as the redirection and authorization modules) are not able to resend the request themselves. Instead, it becomes the application's responsibility. The application can check this flag, and if it's set, resend the exact same request. The modules such as the RedirectionModule or AuthorizationModule will then recognize the resend and fix up or redirect the request as required (i.e. they defer their normal action until the resend).

      If the application resends the request then it must use the same HttpOutputStream instance. This is because the modules use this to recognize the retried request and to perform the necessary work on the request before it's sent.

      Here is a skeleton example of usage: 

           OutputStream out = new HttpOutputStream(1234);
     do
     {
         rsp = con.Post("/cgi-bin/my_cgi", out);
         out.write(...);
         out.close();
     } while (rsp.retryRequest());
     if (rsp.getStatusCode() >= 300)
         ...

      Note that for this to ever return true, the java system property HTTPClient.deferStreamed must be set to true at the beginning of the application (before the HTTPConnection class is loaded). This prevents unwary applications from causing inadvertent memory leaks. If an application does set this, then it must resend any request whose response returns true here in order to prevent memory leaks (a switch to JDK 1.2 will allow us to use weak references and eliminate this problem).

      Returns:
      true if the request should be retried.
      Throws:
      IOException - If any exception occurs on the socket.
      ModuleException - if any module encounters an exception.

    • toString

      public String toString()
      produces a full list of headers and their values, one per line.
      Overrides:
      toString in class Object
      Returns:
      a string containing the headers