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CURLOPT_IGNORE_CONTENT_LENGTH(3) curl_easy_setopt options
CURLOPT_IGNORE_CONTENT_LENGTH - ignore content length
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_IGNORE_CONTENT_LENGTH,
If ignore is set to 1L, ignore the Content-Length header in the HTTP
response and ignore asking for or relying on it for FTP transfers.
This is useful for HTTP with Apache 1.x (and similar servers) which
will report incorrect content length for files over 2 gigabytes. If
this option is used, curl will not be able to accurately report
progress, and will simply stop the download when the server ends the
It is also useful with FTP when for example the file is growing while
the transfer is in progress which otherwise will unconditionally cause
libcurl to report error.
Only use this option if strictly necessary.
CURL *curl = curl_easy_init();
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* we know the server is silly, ignore content-length */
curl_easy_setopt(curl, CURLOPT_IGNORE_CONTENT_LENGTH, 1L);
Added in 7.14.1. Support for FTP added in 7.46.0.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
libcurl 7.76.0 November 4, 2020