CURLOPT_HTTP200ALIASES(3) Library Functions Manual CURLOPT_HTTP200ALIASES(3)
NAME
CURLOPT_HTTP200ALIASES - alternative matches for HTTP 200 OK
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HTTP200ALIASES,
struct curl_slist *aliases);
DESCRIPTION
Pass a pointer to a linked list of aliases to be treated as valid HTTP
200 responses. Some servers respond with a custom header response line.
For example, SHOUTcast servers respond with "ICY 200 OK". Also some old
Icecast 1.3.x servers respond like that for certain user agent headers
or in absence of such. By including this string in your list of aliases,
the response gets treated as a valid HTTP header line such as "HTTP/1.0
200 OK".
The linked list should be a fully valid list of struct curl_slist
structs, and be properly filled in. Use curl_slist_append(3) to create
the list and curl_slist_free_all(3) to clean up an entire list.
The alias itself is not parsed for any version strings. The protocol is
assumed to match HTTP 1.0 when an alias match.
Using this option multiple times makes the last set list override the
previous ones. Set it to NULL to disable its use again.
libcurl does not copy the list, it needs to be kept around until after
the transfer has completed.
DEFAULT
NULL
PROTOCOLS
This functionality affects http only
EXAMPLE
int main(void)
{
CURL *curl = curl_easy_init();
if(curl) {
struct curl_slist *list;
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
list = curl_slist_append(NULL, "ICY 200 OK");
list = curl_slist_append(list, "WEIRDO 99 FINE");
curl_easy_setopt(curl, CURLOPT_HTTP200ALIASES, list);
curl_easy_perform(curl);
curl_slist_free_all(list); /* free the list again */
}
}
AVAILABILITY
Added in curl 7.10.3
RETURN VALUE
curl_easy_setopt(3) returns a CURLcode indicating success or error.
CURLE_OK (0) means everything was OK, non-zero means an error occurred,
see libcurl-errors(3).
SEE ALSO
CURLOPT_HTTP09_ALLOWED(3), CURLOPT_HTTP_VERSION(3)
libcurl 2026-07-12 CURLOPT_HTTP200ALIASES(3)
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