CURLOPT\_PROXYUSERNAME(3) Library Functions Manual CURLOPT\_PROXYUSERNAME(3)

# [NAME](#NAME)

CURLOPT\_PROXYUSERNAME - username to use for proxy authentication

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYUSERNAME,


                          char *username);
```

# [DESCRIPTION](#DESCRIPTION)

Pass a char pointer as parameter, which should be pointing to the null-terminated username to use for the transfer.

[*CURLOPT\_PROXYUSERNAME(3)*](/man/os/curl/CURLOPT_PROXYUSERNAME.3) sets the username to be used in protocol authentication with the proxy.

To specify the proxy password use the [*CURLOPT\_PROXYPASSWORD(3)*](/man/os/curl/CURLOPT_PROXYPASSWORD.3).

The application does not have to keep the string around after setting this option.

# [DEFAULT](#DEFAULT)

blank

# [PROTOCOLS](#PROTOCOLS)

This functionality affects all supported protocols

# [EXAMPLE](#EXAMPLE)

```
int main(void)
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");


    curl_easy_setopt(curl, CURLOPT_PROXY, "http://localhost:8080");


    curl_easy_setopt(curl, CURLOPT_PROXYUSERNAME, "mrsmith");


    curl_easy_setopt(curl, CURLOPT_PROXYPASSWORD, "qwerty");


    result = curl_easy_perform(curl);


    curl_easy_cleanup(curl);


  }
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 7.19.1

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_setopt(3)*](/man/os/curl/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)*](/man/os/curl/libcurl-errors.3).

# [SEE ALSO](#SEE_ALSO)

[**CURLOPT\_HTTPAUTH**(3)](/man/os/curl/CURLOPT_HTTPAUTH.3), [**CURLOPT\_PROXYAUTH**(3)](/man/os/curl/CURLOPT_PROXYAUTH.3), [**CURLOPT\_PROXYPASSWORD**(3)](/man/os/curl/CURLOPT_PROXYPASSWORD.3), [**CURLOPT\_USERNAME**(3)](/man/os/curl/CURLOPT_USERNAME.3)

2026-10-22 libcurl

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Document: CURLOPT_PROXYUSERNAME(3) from curl 8.23.0-r2 (Chainguard OS)
Source: https://github.com/curl/curl.git