-0, what does it refer to?

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curlopt_maxredirs

CURLOPT_MAXREDIRS(3)					     curl_easy_setopt options					      CURLOPT_MAXREDIRS(3)

NAME

       CURLOPT_MAXREDIRS - maximum number of redirects allowed

SYNOPSIS

       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_MAXREDIRS, long amount);

DESCRIPTION

       Pass  a	long.  The  set  number will be the redirection limit amount. If that many redirections have been followed, the next redirect will
       cause an error (CURLE_TOO_MANY_REDIRECTS). This option only makes sense if the CURLOPT_FOLLOWLOCATION(3) is used at the same time.

       Setting the limit to 0 will make libcurl refuse any redirect.

       Set it to -1 for an infinite number of redirects.

DEFAULT

       -1, unlimited

PROTOCOLS

       HTTP(S)

EXAMPLE

       curl = curl_easy_init();
       if(curl) {
	 curl_easy_setopt(curl, CURLOPT_URL, "http://example.com/");

	 /* enable redirect following */
	 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);

	 /* allow three redirects */
	 curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 3L);

	 /* Perform the request */
	 curl_easy_perform(curl);
       }

AVAILABILITY

       Along with HTTP

RETURN VALUE

       Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.

SEE ALSO

       CURLOPT_FOLLOWLOCATION(3),

libcurl 7.54.0							 February 03, 2016					      CURLOPT_MAXREDIRS(3)

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