---
name: "CURLOPT_PROXYHEADER"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_PROXYHEADER"
---

# CURLOPT\_PROXYHEADER(3)

set of HTTP headers to pass to proxy

## NAME

CURLOPT\_PROXYHEADER - set of HTTP headers to pass to proxy

## SYNOPSIS

```
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_PROXYHEADER,
                          struct curl_slist *headers);
```

## DESCRIPTION

Pass a pointer to a linked list of HTTP headers to pass in your HTTP request sent to a proxy. The rules for this list is identical to the *[CURLOPT\_HTTPHEADER(3)](/CURLOPT_HTTPHEADER/3.md)* option's.

The headers set with this option is only ever used in requests sent to a proxy - when there is also a request sent to a host.

The first line in a request (containing the method, usually a GET or POST) is NOT a header and cannot be replaced using this option. Only the lines following the request-line are headers. Adding this method line in this list of headers causes your request to send an invalid header.

Pass a NULL to this to reset back to no custom headers.

## DEFAULT

NULL

## PROTOCOLS

HTTP

## EXAMPLE

```
int main(void)
{
  CURL *curl = curl_easy_init();
  struct curl_slist *list;
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
    curl_easy_setopt(curl, CURLOPT_PROXY, "http://proxy.example.com:80");
    list = curl_slist_append(NULL, "Shoesize: 10");
    list = curl_slist_append(list, "Accept:");
    curl_easy_setopt(curl, CURLOPT_PROXYHEADER, list);
    curl_easy_perform(curl);
    curl_slist_free_all(list); /* free the list again */
  }
}
```

## AVAILABILITY

Added in 7.37.0

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLOPT\_HEADEROPT**(3)](/CURLOPT_HEADEROPT/3.md), [**CURLOPT\_HTTPHEADER**(3)](/CURLOPT_HTTPHEADER/3.md)