curl_pushheader_bynum(3) Introduction to Library Functions

NAME

curl_pushheader_bynum - get a push header by index

SYNOPSIS

#include <curl/curl.h>

char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num);

DESCRIPTION

This is a function that is only functional within a
CURLMOPT_PUSHFUNCTION(3) callback. It makes no sense to try to use it
elsewhere and it has no function then.

It returns the value for the header field at the given index num, for
the incoming server push request or NULL. The data pointed to is
freed by libcurl when this callback returns. The returned pointer
points to a "name:value" string that gets freed when this callback
returns; although not constrained by its type, this string may not be
altered.

PROTOCOLS

This functionality affects http only

EXAMPLE

/* output all the incoming push request headers */
static int push_cb(CURL *parent,
CURL *easy,
size_t num_headers,
struct curl_pushheaders *headers,
void *clientp)
{
int i = 0;
char *field;
do {
field = curl_pushheader_bynum(headers, i);
if(field)
fprintf(stderr, "Push header: %s\n", field);
i++;
} while(field);
return CURL_PUSH_OK; /* permission granted */
}

int main(void)
{
CURLM *multi = curl_multi_init();
curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_cb);
}

AVAILABILITY

Added in curl 7.44.0

RETURN VALUE

Returns a pointer to the header field content or NULL.

SEE ALSO

CURLMOPT_PUSHFUNCTION(3), curl_pushheader_byname(3)

libcurl 2026-01-08 curl_pushheader_bynum(3)