mirror of https://github.com/moparisthebest/curl
102 lines
4.1 KiB
Groff
102 lines
4.1 KiB
Groff
.\" **************************************************************************
|
|
.\" * _ _ ____ _
|
|
.\" * Project ___| | | | _ \| |
|
|
.\" * / __| | | | |_) | |
|
|
.\" * | (__| |_| | _ <| |___
|
|
.\" * \___|\___/|_| \_\_____|
|
|
.\" *
|
|
.\" * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
|
|
.\" *
|
|
.\" * This software is licensed as described in the file COPYING, which
|
|
.\" * you should have received as part of this distribution. The terms
|
|
.\" * are also available at http://curl.haxx.se/docs/copyright.html.
|
|
.\" *
|
|
.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
|
|
.\" * copies of the Software, and permit persons to whom the Software is
|
|
.\" * furnished to do so, under the terms of the COPYING file.
|
|
.\" *
|
|
.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
|
|
.\" * KIND, either express or implied.
|
|
.\" *
|
|
.\" **************************************************************************
|
|
.\"
|
|
.TH CURLMOPT_PUSHFUNCTION 3 "1 Jun 2015" "libcurl 7.44.0" "curl_multi_setopt options"
|
|
.SH NAME
|
|
CURLMOPT_PUSHFUNCTION \- approve or deny server pushes
|
|
.SH SYNOPSIS
|
|
.nf
|
|
#include <curl/curl.h>
|
|
|
|
char *curl_pushheader_bynum(push_headers, int num);
|
|
char *curl_pushheader_byname(push_headers, char *name);
|
|
|
|
int curl_push_callback(CURL *parent,
|
|
CURL *easy,
|
|
size_t num_headers,
|
|
struct curl_pushheaders *headers,
|
|
void *userp);
|
|
|
|
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_PUSHFUNCTION,
|
|
curl_push_callback func);
|
|
.fi
|
|
.SH DESCRIPTION
|
|
This callback gets called when a new HTTP/2 stream is being pushed by the
|
|
server (using the PUSH_PROMISE frame). If no push callback is set, all offered
|
|
pushes will be denied automatically.
|
|
.SH CALLBACK DESCRIPTION
|
|
The callback gets its arguments like this:
|
|
|
|
\fIeasy\fP is a newly created handle that represents this new transfer.
|
|
|
|
\fIparent\fP is the handle of the stream on which this push arrives. The new
|
|
handle has been duphandle()d from the parent, meaning that it has gotten all
|
|
its options inherited. It is then up to the application to alter any options
|
|
if desired.
|
|
|
|
\fInum_headers\fP is the number of name+value pairs that was received and can
|
|
be accessed
|
|
|
|
\fIheaders\fP is a handle used to access push headers using the accessor
|
|
functions described below. This only accesses and provides the PUSH_PROMISE
|
|
headers, the normal response headers will be provided in the header callback
|
|
as usual.
|
|
|
|
\fIuserp\fP is the pointer set with \fICURLMOPT_PUSHDATA(3)\fP
|
|
|
|
If the callback returns CURL_PUSH_OK, the 'easy' handle will be added to the
|
|
multi handle, the callback must not do that by itself.
|
|
|
|
The callback can access PUSH_PROMISE headers with two accessor
|
|
functions. These functions can only be used from within this callback and they
|
|
can only access the PUSH_PROMISE headers. The normal response headers will be
|
|
pased to the header callback for pushed streams just as for normal streams.
|
|
.IP curl_pushheader_bynum
|
|
Returns the header at index 'num' (or NULL). The returned pointer points
|
|
to a "name:value" string that will be freed when this callback returns.
|
|
.IP curl_pushheader_byname
|
|
Returns the value for the given header name (or NULL). This is a shortcut so
|
|
that the application doesn't have to loop through all headers to find the one
|
|
it is interested in.
|
|
.SH CALLBACK RETURN VALUE
|
|
.IP "CURL_PUSH_OK (0)"
|
|
The application has accepted the stream and it can now start receiving data,
|
|
the ownership of the CURL handle has been taken over by the application.
|
|
.IP "CURL_PUSH_DENY (1)"
|
|
The callback denies the stream and no data for this will reach the
|
|
application, the easy handle will be destroyed by libcurl.
|
|
.IP *
|
|
All other return codes are reserved for future use.
|
|
.SH DEFAULT
|
|
NULL, no callback
|
|
.SH PROTOCOLS
|
|
HTTP(S) (HTTP/2 only)
|
|
.SH EXAMPLE
|
|
TODO
|
|
.SH AVAILABILITY
|
|
Added in 7.44.0
|
|
.SH RETURN VALUE
|
|
Returns CURLM_OK if the option is supported, and CURLM_UNKNOWN_OPTION if not.
|
|
.SH "SEE ALSO"
|
|
.BR CURLMOPT_PUSHDATA "(3), " CURLMOPT_PIPELINING "(3), " CURLOPT_PIPEWAIT "(3), "
|
|
.BR RFC 7540
|