NAME
    Plack::Middleware::ForwardedHeaders - Use headers from reverse proxy

SYNOPSIS
        use Plack::Builder;
        builder {
            enable 'ForwardedHeaders';
            $app;
        };

DESCRIPTION
    Uses forwarded headers to determine remote IP address, HTTPS status, and
    requested host. It will adjust the `REMOTE_ADDR', `HTTP_HOST', and
    `psgi.url_scheme' environment items accordingly.

    WARNING: Enabling this middleware without a reverse proxy or a properly
    configured list of trusted proxies will allow users to spoof their IP
    address.

CONFIGURATION
    trusted
        An IP address or an array reference of IP addresses of trusted
        proxies. If set, the forwarded headers will only be used if the
        request comes from one of the addresses listed as trusted.

    use_host
        If set, forwarded headers will be used to determine the host being
        requested. Defaults to false.

    use_scheme
        If set, forwarded headers will be used to determine the URL scheme.
        Defaults to true.

    use_address
        If set, forwarded headers will be used to determine the client
        address. Defaults to true.

    resolve_host
        If set, the hostname of the client will be resolved and saved in the
        REMOTE_HOST. Defaults to false.

HTTP HEADERS
  Host Headers
    The folling headers are used to determine the original requested host
    for a forwarded request.

    X-Forwarded-Host
        Set by Apache 2.2

  Remote Address Headers
    The folling headers are used to determine the remote IP address for a
    forwarded request.

    X-Forwarded-For
        The de-facto standard for finding the originating client IP address.
        Set by Squid, Apache 2.2, and many others.

    X-Real-IP
        Used by nginx.

  Scheme Headers
    The folling headers are used to determine the forwarded scheme:

    X-Forwarded-Proto
    X-Forwarded-SSL
    X-Forwarded-Scheme
    Front-End-HTTPS
        Used by Microsoft Internet Security and Acceleration Server

SEE ALSO
    http://en.wikipedia.org/wiki/X-Forwarded-For

AUTHOR
    Graham Knop <haarg@haarg.org>

LICENSE
    Copyright (c) 2010, Graham Knop

    This library is free software; you can redistribute it and/or modify it
    under the same terms as Perl 5.10.0. For more details, see the full text
    of the licenses in the directory LICENSES.