89 lines
2.9 KiB
Groff
89 lines
2.9 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH curl_pushheader_byname 3 "9 Jun 2023" "libcurl" "libcurl"
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.SH NAME
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curl_pushheader_byname - get a push header by name
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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char *curl_pushheader_byname(struct curl_pushheaders *h, const char *name);
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.fi
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.SH DESCRIPTION
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This is a function that is only functional within a
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\fICURLMOPT_PUSHFUNCTION(3)\fP callback. It makes no sense to try to use it
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elsewhere and it has no function then.
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It returns the value for the given header field name (or NULL) for the
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incoming server push request. This is a shortcut so that the application does
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not have to loop through all headers to find the one it is interested in. The
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data this function points to is freed when this callback returns. If more than
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one header field use the same name, this returns only the first one.
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.SH EXAMPLE
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.nf
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#include <string.h> /* for strncmp */
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static int push_cb(CURL *parent,
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CURL *easy,
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size_t num_headers,
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struct curl_pushheaders *headers,
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void *clientp)
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{
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char *headp;
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int *transfers = (int *)clientp;
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FILE *out;
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headp = curl_pushheader_byname(headers, ":path");
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if(headp && !strncmp(headp, "/push-", 6)) {
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fprintf(stderr, "The PATH is %s\\n", headp);
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/* save the push here */
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out = fopen("pushed-stream", "wb");
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/* write to this file */
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curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
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(*transfers)++; /* one more */
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return CURL_PUSH_OK;
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}
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return CURL_PUSH_DENY;
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}
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int main(void)
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{
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int counter;
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CURLM *multi = curl_multi_init();
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curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_cb);
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curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);
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}
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.fi
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.SH AVAILABILITY
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Added in 7.44.0
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.SH RETURN VALUE
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Returns a pointer to the header field content or NULL.
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.SH "SEE ALSO"
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.BR CURLMOPT_PUSHFUNCTION (3),
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.BR curl_pushheader_bynum (3)
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