X-Forwarded-For Proxy Fix¶
This module provides a middleware that adjusts the WSGI environ based on
X-Forwarded-
headers that proxies in front of an application may
set.
When an application is running behind a proxy server, WSGI may see the request as coming from that server rather than the real client. Proxies set various headers to track where the request actually came from.
This middleware should only be used if the application is actually behind such a proxy, and should be configured with the number of proxies that are chained in front of it. Not all proxies set all the headers. Since incoming headers can be faked, you must set how many proxies are setting each header so the middleware knows what to trust.
- class werkzeug.middleware.proxy_fix.ProxyFix(app, x_for=1, x_proto=1, x_host=0, x_port=0, x_prefix=0)¶
Adjust the WSGI environ based on
X-Forwarded-
that proxies in front of the application may set.X-Forwarded-For
setsREMOTE_ADDR
.X-Forwarded-Proto
setswsgi.url_scheme
.X-Forwarded-Host
setsHTTP_HOST
,SERVER_NAME
, andSERVER_PORT
.X-Forwarded-Port
setsHTTP_HOST
andSERVER_PORT
.X-Forwarded-Prefix
setsSCRIPT_NAME
.
You must tell the middleware how many proxies set each header so it knows what values to trust. It is a security issue to trust values that came from the client rather than a proxy.
The original values of the headers are stored in the WSGI environ as
werkzeug.proxy_fix.orig
, a dict.- Parameters:
app (WSGIApplication) – The WSGI application to wrap.
x_for (int) – Number of values to trust for
X-Forwarded-For
.x_proto (int) – Number of values to trust for
X-Forwarded-Proto
.x_host (int) – Number of values to trust for
X-Forwarded-Host
.x_port (int) – Number of values to trust for
X-Forwarded-Port
.x_prefix (int) – Number of values to trust for
X-Forwarded-Prefix
.
from werkzeug.middleware.proxy_fix import ProxyFix # App is behind one proxy that sets the -For and -Host headers. app = ProxyFix(app, x_for=1, x_host=1)
Changelog
Changed in version 1.0: The
num_proxies
argument and attribute; theget_remote_addr
method; and the environ keysorig_remote_addr
,orig_wsgi_url_scheme
, andorig_http_host
were removed.Changed in version 0.15: All headers support multiple values. Each header is configured with a separate number of trusted proxies.
Changed in version 0.15: Original WSGI environ values are stored in the
werkzeug.proxy_fix.orig
dict.Changed in version 0.15: Support
X-Forwarded-Port
andX-Forwarded-Prefix
.Changed in version 0.15:
X-Forwarded-Host
andX-Forwarded-Port
modifySERVER_NAME
andSERVER_PORT
.