1--- 2c: Copyright (C) Daniel Stenberg, <daniel.se>, et al. 3SPDX-License-Identifier: curl 4Title: curl_pushheader_bynum 5Section: 3 6Source: libcurl 7See-also: 8 - CURLMOPT_PUSHFUNCTION (3) 9 - curl_pushheader_byname (3) 10--- 11 12# NAME 13 14curl_pushheader_bynum - get a push header by index 15 16# SYNOPSIS 17 18~~~c 19#include <curl/curl.h> 20 21char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num); 22~~~ 23 24# DESCRIPTION 25 26This is a function that is only functional within a 27CURLMOPT_PUSHFUNCTION(3) callback. It makes no sense to try to use it 28elsewhere and it has no function then. 29 30It returns the value for the header field at the given index **num**, for 31the incoming server push request or NULL. The data pointed to is freed by 32libcurl when this callback returns. The returned pointer points to a 33"name:value" string that gets freed when this callback returns. 34 35# EXAMPLE 36 37~~~c 38/* output all the incoming push request headers */ 39static int push_cb(CURL *parent, 40 CURL *easy, 41 size_t num_headers, 42 struct curl_pushheaders *headers, 43 void *clientp) 44{ 45 int i = 0; 46 char *field; 47 do { 48 field = curl_pushheader_bynum(headers, i); 49 if(field) 50 fprintf(stderr, "Push header: %s\n", field); 51 i++; 52 } while(field); 53 return CURL_PUSH_OK; /* permission granted */ 54} 55 56int main(void) 57{ 58 CURLM *multi = curl_multi_init(); 59 curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_cb); 60} 61~~~ 62 63# AVAILABILITY 64 65Added in 7.44.0 66 67# RETURN VALUE 68 69Returns a pointer to the header field content or NULL. 70