DAV::Response(3) User Contributed Perl Documentation DAV::Response(3)NAMEHTTP::DAV::Response - represents a WebDAV HTTP Response (ala
HTTP::Response)
SYNOPSIS
require HTTP::DAV::Response;
DESCRIPTION
The HTTP::DAV::Response class encapsulates HTTP style responses. A
response consists of a response line, some headers, and (potentially
empty) content.
HTTP::DAV::Response is a subclass of "HTTP::Response" and therefore
inherits its methods. (HTTP::Response in turn inherits it's methods
from "HTTP::Message").
Therefore, this class actually inherits a rich library of functions.
You are more likely wanting to read the "HTTP::Response" class as
opposed to this class.
Instances of this class are usually created by a "HTTP::DAV::Resource"
object after it has performed some request (such as get, lock, delete,
etc). You use the object to analyse the success or otherwise of the
request.
HTTP::DAV::Response was created to handle two extra functions that
normal HTTP Responses don't require:
- WebDAV reponses have 6 extra error codes: 102, 207, 422, 423, 424 and 507. Older versions of the LWP's C<HTTP::Status> class did not have these extra codes. These were added.
- WebDAV responses can actually contain more than one response (and often DO contain more than one) in the form of a "Multistatus". These multistatus responses come in the form of an XML document. HTTP::DAV::Response can accurately parse these XML responses and emulate the normal of the C<HTTP::Response>.
HTTP::DAV::Response transparently implements these extra features
without the user having to be aware, so you really should be reading
the "HTTP::Response" documentation for most of the things you want to
do (have I already said that?).
There are only a handful of custom functions that HTTP::DAV::Response
returns and those are to handle multistatus requests, "messages()" and
"codes()".
The six extra status codes that DAV servers can be returned in an HTTP
Response are:
102 => "Processing. Server has accepted the request, but has not yet
completed it",
207 => "Multistatus",
422 => "Unprocessable Entity. Bad client XML sent?",
423 => "Locked. The source or destination resource is locked",
424 => "Failed Dependency",
507 => "Insufficient Storage. The server is unable to store the
request",
See "HTTP::Status" for the rest.
HANDLING A MULTISTATUS
So, many DAV requests may return a multistatus ("207 multistatus")
instead of, say, "200 OK" or "403 Forbidden".
The HTTP::DAV::Response object stores each "response" sent back in the
multistatus. You access them by array number.
The following code snippet shows what you will normally want to do:
... $response = $resource->lock();
if ( $response->is_multistatus() ) {
foreach $num ( 0 .. $response->response_count() ) {
($err_code,$mesg,$url,$desc) =
$response->response_bynum($num);
print "$mesg ($err_code) for $url\n";
}
}
Would produce something like this:
Failed Dependency (424) for /test/directory
Locked (423) for /test/directory/file3
This says that we couldn't lock /test/directory because file3 which
exists inside is already locked by somebody else.
METHODS
is_multistatus
This function takes no arguments and returns a 1 or a 0.
For example: if ($response->is_multistatus() ) { }
If the HTTP reply had "207 Multistatus" in the header then that
indicates that there are multiple status messages in the XML
content that was returned.
In this event, you may be interested in knowing what the individual
messages were. To do this you would then use "messages".
response_count
Takes no arguments and returns "the number of error responses -1"
that we got. Why -1? Because usually you will want to use this
like an array operator:
foreach $num ( 0 .. $response->response_count() ) {
print $response->message_bynum(); }
response_bynum
Takes one argument, the "response number" that you're interested
in. And returns an array of details:
($code,$message,$url,$description) = response_bynum(2);
where
$code - is the HTTP error code (e.g. 403, 423, etc).
$message - is the associated message for that error code.
$url - is the url that this error applies to (recall that there
can be multiple responses within one response and they all relate
to one URL)
$description - is server's attempt at an english description of
what happened.
code_bynum
Takes one argument, the "response number" that you're interested
in, and returns it's code. E.g:
$code = $response->code_bynum(1);
See "response_bynum()"
message_bynum
Takes one argument, the "response number" that you're interested
in, and returns it's message. E.g:
$code = $response->message_bynum(1);
See "response_bynum()"
url_bynum
Takes one argument, the "response number" that you're interested
in, and returns it's url. E.g:
$code = $response->message_bynum(1);
See "response_bynum()"
description_bynum
Takes one argument, the "response number" that you're interested
in, and returns it's description. E.g:
$code = $response->message_description(1);
See "response_bynum()"
messages
Takes no arguments and returns all of the messages returned in a
multistatus response. If called in a scalar context then all of the
messages will be returned joined together by newlines. If called in
an array context the messages will be returned as an array.
$messages = $response->messages(); e.g. $messages eq
"Forbidden\nLocked";
@messages = $response->messages(); e.g. @messages eq ["Forbidden",
"Locked"];
This routine is a variant on the standard "HTTP::Response"
"message()".
perl v5.14.1 2010-11-07 DAV::Response(3)