CURLOPT_PROXY_TLSAUTH_TYPE - HTTPS proxy TLS authentication methods

Added in curl 7.52.0

blank

Pass a pointer to a null-terminated string as parameter. The string should be the method of the TLS authentication used for the HTTPS connection. Supported method is "SRP". Using this option multiple times makes the last set string override the previous ones. Set it to NULL to restore to internal default. The application does not have to keep the string around after setting this option. SRP TLS-SRP authentication. Secure Remote Password authentication for TLS is defined in RFC 5054 and provides mutual authentication if both sides have a shared secret. To use TLS-SRP, you must also set the CURLOPT_PROXY_TLSAUTH_USERNAME(3) and CURLOPT_PROXY_TLSAUTH_PASSWORD(3) options.

int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/"); curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy"); curl_easy_setopt(curl, CURLOPT_PROXY_TLSAUTH_TYPE, "SRP"); curl_easy_setopt(curl, CURLOPT_PROXY_TLSAUTH_USERNAME, "user"); curl_easy_setopt(curl, CURLOPT_PROXY_TLSAUTH_PASSWORD, "secret"); res = curl_easy_perform(curl); curl_easy_cleanup(curl); } }

CURLOPT_PROXY_TLSAUTH_TYPE - HTTPS proxy TLS authentication methods

This functionality affects all TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc. This option works only with the following TLS backends: GnuTLS and OpenSSL

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).

CURLOPT_PROXY_TLSAUTH_PASSWORD(3), CURLOPT_PROXY_TLSAUTH_USERNAME(3), CURLOPT_TLSAUTH_PASSWORD(3), CURLOPT_TLSAUTH_USERNAME(3) libcurl 2025-06-16 CURLOPT_PROXY_TLSAUTH_TYPE(3)

#include <curl/curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_TYPE, char *type);