CURLINFO_RETRY_AFTER explained

Name

CURLINFO_RETRY_AFTER - returns the Retry-After retry delay

Synopsis

#include <curl/curl.h>
 
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_RETRY_AFTER,
                           curl_off_t *retry);

Description

Pass a pointer to a curl_off_t variable to receive the number of seconds the HTTP server suggests the client should wait until the next request is issued. The information from the "Retry-After:" header.

While the HTTP header might contain a fixed date string, the CURLINFO_RETRY_AFTER will always return number of seconds to wait - or zero if there was no header or the header could not be parsed.

Default

Returns zero delay if there was no header.

Protocols

HTTP(S)

Example

CURL *curl = curl_easy_init();
if(curl) {
  CURLcode res;
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
  res = curl_easy_perform(curl);
  if(res == CURLE_OK) {
    curl_off_t wait = 0;
    curl_easy_getinfo(curl, CURLINFO_RETRY_AFTER, &wait);
    if(wait)
      printf("Wait for %" CURL_FORMAT_CURL_OFF_T " seconds\n", wait);
  }
  curl_easy_cleanup(curl);
}

Availability

Added in 7.66.0

Return value

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.