Source code for server.proxy_helpers

from flask import request, current_app


behind_proxy_options = (None, "nginx", "npm")



def real_remote_addr():
    """Returns the real remote IP address. Uses BEHIND_PROXY config setting.

    When the app is not behind a proxy (BEHIND_PROXY==None), the returned
    address is just request.remote_addr. Otherwise, the real address must be
    retrieved from a special header set by the proxy service.
    """
    proxy = current_app.config.get("BEHIND_PROXY")
    if proxy in (None, "npm"):
        return request.remote_addr
    elif str(proxy).lower() == "nginx":
        return request.headers.get("X-Real-IP", "<Missing X-Real-IP header!>")
    else:
        return "<Bad BEHIND_PROXY config!>"