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Apache error 503 when using ProxyPass:

Posted by jpluimers on 2016/12/05

When using ProxyPass (for instance within a Location) in Apache and you get an http error 503 (service unavailable), then usually the page/service to which the proxy directs to is dead.

I had this when shellinabox (forked from the old Google code repo) died on me.

In addition, ensure your ProxyPass statements contain a slash at the end your you will get a http error 502  (bad gateway):

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET /account/login.
Reason: DNS lookup failure for:
Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.

<Location /shell>
ProxyPass http://localhost:4200/
Require all granted
<Location />
Require all granted

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