---
name: "CURLINFO_USED_PROXY"
section: "3"
platform: "linux"
package: "curl"
version: "8.23.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/CURLINFO_USED_PROXY"
---

# CURLINFO\_USED\_PROXY(3)

whether the transfer used a proxy

## NAME

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

## SYNOPSIS

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

## 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

This functionality affects all supported protocols

## 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

Added in curl 8.7.0

## RETURN VALUE

*[curl\_easy\_getinfo(3)](/curl_easy_getinfo/3.md)* returns a CURLcode indicating success or error.

CURLE\_OK (0) means everything was OK, non-zero means an error occurred, see *[libcurl-errors(3)](/libcurl-errors/3.md)*.

## SEE ALSO

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