CURLINFO\_USED\_PROXY(3) Library Functions Manual CURLINFO\_USED\_PROXY(3)

# [NAME](#NAME)

CURLINFO\_USED\_PROXY - whether the transfer used a proxy

# [SYNOPSIS](#SYNOPSIS)

```
#include <curl/curl.h>
CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_USED_PROXY,


                           long *authp);
```

# [DESCRIPTION](#DESCRIPTION)

Pass a pointer to a long. It gets set to zero set if no proxy was used in the previous transfer or a non-zero value if a proxy was used.

# [PROTOCOLS](#PROTOCOLS)

This functionality affects all supported protocols

# [EXAMPLE](#EXAMPLE)

```
int main(int argc, char *argv[])
{


  CURL *curl = curl_easy_init();


  if(curl) {


    CURLcode result;


    curl_easy_setopt(curl, CURLOPT_URL, argv[1]);


    curl_easy_setopt(curl, CURLOPT_PROXY, "http://127.0.0.1:80");


    curl_easy_setopt(curl, CURLOPT_NOPROXY, "example.com");


    result = curl_easy_perform(curl);


    if(result == CURLE_OK) {


      /* extract the available proxy authentication types */


      long used;


      result = curl_easy_getinfo(curl, CURLINFO_USED_PROXY, &used);


      if(result == CURLE_OK) {


        printf("The proxy was %sused\n", used ? "" : "NOT ");


      }


    }


    curl_easy_cleanup(curl);


  }
}
```

# [AVAILABILITY](#AVAILABILITY)

Added in curl 8.7.0

# [RETURN VALUE](#RETURN_VALUE)

[*curl\_easy\_getinfo(3)*](/man/os/curl/curl_easy_getinfo.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\_NOPROXY**(3)](/man/os/curl/CURLOPT_NOPROXY.3), [**CURLOPT\_PROXY**(3)](/man/os/curl/CURLOPT_PROXY.3), [**curl\_easy\_getinfo**(3)](/man/os/curl/curl_easy_getinfo.3), [**curl\_easy\_setopt**(3)](/man/os/curl/curl_easy_setopt.3)

2026-10-31 libcurl

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Document: CURLINFO_USED_PROXY(3) from curl 8.23.0-r3 (Chainguard OS)
Source: https://github.com/curl/curl.git