HTTPClient
Class Response

java.lang.Object
  HTTPClient.Response

All Implemented Interfaces:

Cloneable, GlobalConstants, RoResponse

public final class Response

extends Object

implements RoResponse, GlobalConstants, Cloneable

This class represents an intermediate response. It's used internally by the modules. When all modules have handled the response then the HTTPResponse fills in its fields with the data from this class.

Field Summary

static int	CD_0
static int	CD_CHUNKED
static int	CD_CLOSE
static int	CD_CONTLEN
static int	CD_HDRS
static int	CD_MP_BR
static int	CD_NONE Content delimiters
(package private) int	cd_type this indicates how the length of the entity body is determined
(package private) int	ContentLength the message length of the response if either there is no data (in which case ContentLength=0) or if the message length is controlled by a Content-Length header.
(package private) byte[]	Data the data (body) returned.
(package private) URI	EffectiveURI the final URI of the document.
(package private) boolean	final_resp should this response be handled further?
(package private) boolean	got_headers signals if we have got and parsed the headers yet
(package private) boolean	got_trailers signals if we have got and parsed the trailers yet
(package private) CIHashtable	Headers any headers which were received and do not fit in the above list.
static int	HTTP possible http protocols we (might) handle
static int	HTTP_1_0 some known http versions
static int	HTTP_1_1
static int	HTTP_NG
(package private) HTTPResponse	http_resp the HTTPResponse we're coupled with
static int	HTTPS
InputStream	inp_stream our input stream (usually from the stream demux).
(package private) boolean	isFirstResponse
(package private) boolean	reading_headers signals if we in the process of reading the headers
(package private) String	ReasonLine the reason line associated with the status code.
(package private) Request	req
(package private) String	resource the resource in the request (for debugging purposes)
(package private) boolean	retry should the request be retried by the application?
static int	SHTTP
(package private) int	StatusCode the status code returned.
(package private) int	timeout the timeout for read operations
(package private) CIHashtable	Trailers any trailers which were received and do not fit in the above list.
(package private) boolean	trailers_read
(package private) String	Version the HTTP version of the response.

Constructor Summary

(package private)	Response(Request request, boolean used_proxy, StreamDemultiplexor stream_handler) Creates a new Response and registers it with the stream-demultiplexor.
(package private)	Response(Request request, InputStream is) Creates a new Response that reads from the given stream.
	Response(String version, int status, String reason, NVPair[] headers, byte[] data, InputStream is, int cont_len) Create a new response with the given info.

Method Summary

Object	clone()
void	deleteHeader(String header) Removes a header field from the list of headers.
void	deleteTrailer(String trailer) Removes a trailer field from the list of trailers.
(package private) int	getContinue() Wait for either a '100 Continue' or an error.
byte[]	getData() Reads all the response data into a byte array.
URI	getEffectiveURI() get the final URI of the document.
URL	getEffectiveURL() Deprecated. use getEffectiveURI() instead
String	getHeader(String hdr) retrieves the field for a given header.
Date	getHeaderAsDate(String hdr) retrieves the field for a given header.
int	getHeaderAsInt(String hdr) retrieves the field for a given header.
InputStream	getInputStream() Gets an input stream from which the returned data can be read.
String	getReasonLine() give the reason line associated with the status code.
int	getStatusCode() give the status code for this request.
String	getTrailer(String trailer) Retrieves the field for a given trailer.
Date	getTrailerAsDate(String trailer) Retrieves the field for a given trailer.
int	getTrailerAsInt(String trailer) Retrieves the field for a given tailer.
String	getVersion() get the HTTP version used for the response.
boolean	hasEntity() Some responses such as those from a HEAD or with certain status codes don't have an entity.
(package private) void	markAsFirstResponse(Request req) This marks this response as belonging to the first request made over an HTTPConnection.
(package private) void	readTrailers(InputStream inp) This is called by the StreamDemultiplexor to read all the trailers of a chunked encoded entity.
boolean	retryRequest()
void	setEffectiveURI(URI final_uri) set the final URI of the document.
void	setEffectiveURL(URL final_url) Deprecated. use setEffectiveURI() instead
void	setHeader(String header, String value) Set a header field in the list of headers.
void	setRetryRequest(boolean flag) Should the request be retried by the application? This can be used by modules to signal to the application that it should retry the request.
void	setTrailer(String trailer, String value) Set a trailer field in the list of trailers.

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

http_resp

HTTPResponse http_resp

the HTTPResponse we're coupled with

timeout

int timeout

the timeout for read operations

inp_stream

public InputStream inp_stream

our input stream (usually from the stream demux). Push input streams onto this if necessary.

resource

String resource

the resource in the request (for debugging purposes)

StatusCode

int StatusCode

the status code returned.

ReasonLine

String ReasonLine

the reason line associated with the status code.

Version

String Version

the HTTP version of the response.

EffectiveURI

URI EffectiveURI

the final URI of the document.

Headers

CIHashtable Headers

any headers which were received and do not fit in the above list.

Trailers

CIHashtable Trailers

any trailers which were received and do not fit in the above list.

ContentLength

int ContentLength

the message length of the response if either there is no data (in which case ContentLength=0) or if the message length is controlled by a Content-Length header. If neither of these, then it's -1

cd_type

int cd_type

this indicates how the length of the entity body is determined

Data

byte[] Data

the data (body) returned.

reading_headers

boolean reading_headers

signals if we in the process of reading the headers

got_headers

boolean got_headers

signals if we have got and parsed the headers yet

got_trailers

boolean got_trailers

signals if we have got and parsed the trailers yet

final_resp

boolean final_resp

should this response be handled further?

retry

boolean retry

should the request be retried by the application?

trailers_read

boolean trailers_read

req

Request req

isFirstResponse

boolean isFirstResponse

HTTP

public static final int HTTP

possible http protocols we (might) handle

See Also:

Constant Field Values

HTTPS

public static final int HTTPS

See Also:

Constant Field Values

SHTTP

public static final int SHTTP

See Also:

Constant Field Values

HTTP_NG

public static final int HTTP_NG

See Also:

Constant Field Values

HTTP_1_0

public static final int HTTP_1_0

some known http versions

See Also:

Constant Field Values

HTTP_1_1

public static final int HTTP_1_1

See Also:

Constant Field Values

CD_NONE

public static final int CD_NONE

Content delimiters

See Also:

Constant Field Values

CD_HDRS

public static final int CD_HDRS

See Also:

Constant Field Values

CD_0

public static final int CD_0

See Also:

Constant Field Values

CD_CLOSE

public static final int CD_CLOSE

See Also:

Constant Field Values

CD_CONTLEN

public static final int CD_CONTLEN

See Also:

Constant Field Values

CD_CHUNKED

public static final int CD_CHUNKED

See Also:

Constant Field Values

CD_MP_BR

public static final int CD_MP_BR

See Also:

Constant Field Values

Constructor Detail

Response

Response(Request request,
         boolean used_proxy,
         StreamDemultiplexor stream_handler)
   throws IOException

Creates a new Response and registers it with the stream-demultiplexor.

Response

Response(Request request,
         InputStream is)
   throws IOException

Creates a new Response that reads from the given stream. This is used for the CONNECT subrequest which is used in establishing an SSL tunnel through a proxy.

Parameters:

request - the subrequest

is - the input stream from which to read the headers and data.

Response

public Response(String version,
                int status,
                String reason,
                NVPair[] headers,
                byte[] data,
                InputStream is,
                int cont_len)

Create a new response with the given info. This is used when creating a response in a requestHandler().

If data is not null then that is used; else if the is is not null that is used; else the entity is empty. If the input stream is used then cont_len specifies the length of the data that can be read from it, or -1 if unknown.

Parameters:

version - the response version (such as "HTTP/1.1")

status - the status code

reason - the reason line

headers - the response headers

data - the response entity

is - the response entity as an InputStream

cont_len - the length of the data in the InputStream

Method Detail

getStatusCode

public final int getStatusCode()
                        throws IOException

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

Specified by:

getStatusCode in interface RoResponse

Returns:

the status code

Throws:

IOException - If any exception occurs on the socket.

getReasonLine

public final String getReasonLine()
                           throws IOException

give the reason line associated with the status code.

Specified by:

getReasonLine in interface RoResponse

Returns:

the reason line associated with the status code.

Throws:

IOException - If any exception occurs on the socket.

getVersion

public final String getVersion()
                        throws IOException

get the HTTP version used for the response.

Specified by:

getVersion in interface RoResponse

Returns:

the HTTP version returned by the server.

Throws:

IOException - If any exception occurs on the socket.

getContinue

int getContinue()
          throws IOException

Wait for either a '100 Continue' or an error.

Returns:

the return status.

Throws:

IOException

getEffectiveURI

public final URI getEffectiveURI()
                          throws IOException

get the final URI of the document. This is set if the original request was deferred via the "moved" (301, 302, or 303) return status.

Returns:

the new URI, or null if not redirected

Throws:

IOException - If any exception occurs on the socket.

setEffectiveURI

public void setEffectiveURI(URI final_uri)

set the final URI of the document. This is only for internal use.

getEffectiveURL

public final URL getEffectiveURL()
                          throws IOException

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.

Throws:

IOException - If any exception occurs on the socket.

See Also:

getEffectiveURI()

setEffectiveURL

public void setEffectiveURL(URL final_url)

Deprecated. use setEffectiveURI() instead

set the final URL of the document. This is only for internal use.

See Also:

setEffectiveURI(HTTPClient.URI)

getHeader

public String getHeader(String hdr)
                 throws IOException

retrieves the field for a given header.

Specified by:

getHeader in interface RoResponse

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.

getHeaderAsInt

public int getHeaderAsInt(String hdr)
                   throws IOException,
                          NumberFormatException

retrieves the field for a given header. The value is parsed as an int.

Specified by:

getHeaderAsInt in interface RoResponse

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.

getHeaderAsDate

public Date getHeaderAsDate(String hdr)
                     throws IOException,
                            IllegalArgumentException

retrieves the field 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 IllegalArgumentException is thrown.

Note: When sending dates use Util.httpDate().

Specified by:

getHeaderAsDate in interface RoResponse

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.

IllegalArgumentException - If the header cannot be parsed as a date or time.

setHeader

public void setHeader(String header,
                      String value)

Set a header field in the list of headers. If the header already exists it will be overwritten; otherwise the header will be added to the list. This is used by some modules when they process the header so that higher level stuff doesn't get confused when the headers and data don't match.

Parameters:

header - The name of header field to set.

value - The value to set the field to.

deleteHeader

public void deleteHeader(String header)

Removes a header field from the list of headers. This is used by some modules when they process the header so that higher level stuff doesn't get confused when the headers and data don't match.

Parameters:

header - The name of header field to remove.

getTrailer

public String getTrailer(String trailer)
                  throws IOException

Retrieves the field for a given trailer. Note that this should not be invoked until all the response data has been read. If invoked before, it will force the data to be read via getData().

Specified by:

getTrailer in interface RoResponse

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.

getTrailerAsInt

public int getTrailerAsInt(String trailer)
                    throws IOException,
                           NumberFormatException

Retrieves the field for a given tailer. The value is parsed as an int.

Specified by:

getTrailerAsInt in interface RoResponse

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.

getTrailerAsDate

public Date getTrailerAsDate(String trailer)
                      throws IOException,
                             IllegalArgumentException

Retrieves the field 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().

Specified by:

getTrailerAsDate in interface RoResponse

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.

IllegalArgumentException - If the header cannot be parsed as a date or time.

setTrailer

public void setTrailer(String trailer,
                       String value)

Set a trailer field in the list of trailers. If the trailer already exists it will be overwritten; otherwise the trailer will be added to the list. This is used by some modules when they process the trailer so that higher level stuff doesn't get confused when the trailer and data don't match.

Parameters:

trailer - The name of trailer field to set.

value - The value to set the field to.

deleteTrailer

public void deleteTrailer(String trailer)

Removes a trailer field from the list of trailers. This is used by some modules when they process the trailer so that higher level stuff doesn't get confused when the trailers and data don't match.

Parameters:

trailer - The name of trailer field to remove.

getData

public byte[] getData()
               throws IOException

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 called then this method only returns any unread data remaining on the stream and then closes it.

Specified by:

getData in interface RoResponse

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

See Also:

getInputStream()

getInputStream

public InputStream getInputStream()
                           throws IOException

Gets an input stream from which the returned data can be read. Note that if getData() had been previously called it will actually return a ByteArrayInputStream created from that data.

Specified by:

getInputStream in interface RoResponse

Returns:

the InputStream.

Throws:

IOException - If any exception occurs on the socket.

See Also:

getData()

hasEntity

public boolean hasEntity()
                  throws IOException

Some responses such as those from a HEAD or with certain status codes don't have an entity. This is detected by the client and can be queried here. Note that this won't try to do a read() on the input stream (it will however cause the headers to be read and parsed if not already done).

Returns:

true if the response has an entity, false otherwise

Throws:

IOException

Since:

V0.3-1

setRetryRequest

public void setRetryRequest(boolean flag)

Should the request be retried by the application? This can be used by modules to signal to the application that it should retry the request. It's used when the request used an HttpOutputStream and the module is therefore not able to retry the request itself. This flag is false by default.

If a module sets this flag then it must also reset() the the HttpOutputStream so it may be reused by the application. It should then also use this HttpOutputStream to recognize the retried request in the requestHandler().

Parameters:

flag - indicates whether the application should retry the request.

retryRequest

public boolean retryRequest()

Returns:

true if the request should be retried.

readTrailers

void readTrailers(InputStream inp)
            throws IOException

This is called by the StreamDemultiplexor to read all the trailers of a chunked encoded entity.

Parameters:

inp - the raw input stream to read from

Throws:

IOException - if any IOException is thrown by the stream

markAsFirstResponse

void markAsFirstResponse(Request req)

This marks this response as belonging to the first request made over an HTTPConnection. The con and req parameters are needed in case we have to do a resend of the request - this is to handle buggy servers which barf upon receiving a request marked as HTTP/1.1 .

Parameters:

req - The Request sent

clone

public Object clone()

Returns:

a clone of this request object