CURLOPT_PR...SAUTH_TYPE(3)

💖 NAME 💖

CURLOPT_PROXY_TLSAUTH_TYPE - HTTPS proxy TLS authentication methods.

Bestie, welcome to the Library Functions Manual! The page title up top is CURLOPT_PR...SAUTH_TYPE(3) (yes, it gets abbreviated like that), and the full main-character option is CURLOPT_PROXY_TLSAUTH_TYPE. It's giving HTTPS proxy TLS authentication methods, no cap.

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✨ SYNOPSIS ✨

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXY_TLSAUTH_TYPE,
                          char *type);

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🌸 DESCRIPTION 🌸

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. Fr fr, it can dip after you set it.

• 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.

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🎀 DEFAULT 🎀

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🦋 PROTOCOLS 🦋

• 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.

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🍓 EXAMPLE 🍓

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode result;
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
    curl_easy_setopt(curl, CURLOPT_PROXY, "https://proxy.example");
    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");
    result = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

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💜 AVAILABILITY 💜

Added in curl 7.52.0.

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⭐ 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).

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👑 SEE ALSO 👑

• CURLOPT_PROXY_TLSAUTH_PASSWORD(3)
• CURLOPT_PROXY_TLSAUTH_USERNAME(3)
• CURLOPT_TLSAUTH_PASSWORD(3)
• CURLOPT_TLSAUTH_USERNAME(3)

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Sign-off bestie: this iconic page comes from libcurl, dated 2026-10-12, with footer title CURLOPT_PR...SAUTH_TYPE(3). Byeee 💖🦋✨