The HTTP Proxy-Authorization request header contains the credentials to authenticate a user agent to a proxy server, usually after the server has responded with a 407 Proxy Authentication Required status and the Proxy-Authenticate header.

Header type Request header
Forbidden header name no


Proxy-Authorization: <type> <credentials>


Authentication type. A common type is "Basic". See also the IANA registry of Authentication schemes.
The credentials are constructed like this:
  • The username and the password are combined with a colon (aladdin:opensesame).
  • The resulting string is base64 encoded (YWxhZGRpbjpvcGVuc2VzYW1l).

Note: Base64 encoding does not mean encryption or hashing! This method is equally secure as sending the credentials in clear text (base64 is a reversible encoding). Prefer to use HTTPS in conjunction with Basic Authentication.


Proxy-Authorization: Basic YWxhZGRpbjpvcGVuc2VzYW1l


Specification Title
RFC 7235, section 4.4: Proxy-Authorization HTTP/1.1: Authentication
RFC 7617 The 'Basic' HTTP Authentication Scheme

See also