quickjs-tart

quickjs-based runtime for wallet-core logic
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curl_pushheader_byname.md (1994B)

      1 ---
      2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      3 SPDX-License-Identifier: curl
      4 Title: curl_pushheader_byname
      5 Section: 3
      6 Source: libcurl
      7 See-also:
      8   - CURLMOPT_PUSHFUNCTION (3)
      9   - curl_pushheader_bynum (3)
     10 Protocol:
     11   - HTTP
     12 Added-in: 7.44.0
     13 ---
     14 
     15 # NAME
     16 
     17 curl_pushheader_byname - get a push header by name
     18 
     19 # SYNOPSIS
     20 
     21 ~~~c
     22 #include <curl/curl.h>
     23 
     24 char *curl_pushheader_byname(struct curl_pushheaders *h, const char *name);
     25 ~~~
     26 
     27 # DESCRIPTION
     28 
     29 This is a function that is only functional within a
     30 CURLMOPT_PUSHFUNCTION(3) callback. It makes no sense to try to use it
     31 elsewhere and it has no function then.
     32 
     33 It returns the value for the given header field name (or NULL) for the
     34 incoming server push request. This is a shortcut so that the application does
     35 not have to loop through all headers to find the one it is interested in. The
     36 data this function points to is freed when this callback returns. If more than
     37 one header field use the same name, this returns only the first one.
     38 
     39 # %PROTOCOLS%
     40 
     41 # EXAMPLE
     42 
     43 ~~~c
     44 #include <string.h> /* for strncmp */
     45 
     46 static int push_cb(CURL *parent,
     47                    CURL *easy,
     48                    size_t num_headers,
     49                    struct curl_pushheaders *headers,
     50                    void *clientp)
     51 {
     52   char *headp;
     53   int *transfers = (int *)clientp;
     54   FILE *out;
     55   headp = curl_pushheader_byname(headers, ":path");
     56   if(headp && !strncmp(headp, "/push-", 6)) {
     57     fprintf(stderr, "The PATH is %s\n", headp);
     58 
     59     /* save the push here */
     60     out = fopen("pushed-stream", "wb");
     61 
     62     /* write to this file */
     63     curl_easy_setopt(easy, CURLOPT_WRITEDATA, out);
     64 
     65     (*transfers)++; /* one more */
     66 
     67     return CURL_PUSH_OK;
     68   }
     69   return CURL_PUSH_DENY;
     70 }
     71 
     72 int main(void)
     73 {
     74   int counter;
     75   CURLM *multi = curl_multi_init();
     76   curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, push_cb);
     77   curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &counter);
     78 }
     79 ~~~
     80 
     81 # %AVAILABILITY%
     82 
     83 # RETURN VALUE
     84 
     85 Returns a pointer to the header field content or NULL.