Device Proxy. A reverse HTTP Proxy that can inspect and manipulate HTTP Headers before sending upstream.
Inspects incoming HTTP requests adds some HTTP headers and proxies upstream. Has ability to add extra cookies for HTTP responses being sent back to the client.
$ pip install device-proxy
Run with twistd:
$ twistd -n devproxy --config config.yaml
This is what the processing chain looks like:
+------------------+ | | | Header & Cookie set v | (1) HAProxy -> (2) *n* DeviceProxies | (3) | (if Cookie or Header set) +--------------------------------> (4) *n* Backend Apps
- Haproxy receives incoming traffic from Nginx
- Request is passed to n number of Device Proxies running. HTTP headers are inserted (possibly from cached WURFL or OpenDDR lookups). Device Proxy has the option of inserting Cookies into the HTTP response which can cache the Device Lookup (for subsequent requests HAProxy (1) could use these cookie values to skip DeviceProxy completely for the lifetime of the Cookie.) DeviceProxy reverse proxies back to HAProxy with HTTP headers inserted.
- HAProxy inspects the HTTP headers & cookies received and selects appropriate backend application for the request. HAProxy can have a default fallback backend. If the Cookie is already set then the DeviceProxies are skipped.
- The Backend application renders the request with a template set suitable for the given HTTP request.
By default DeviceProxy only caches the lookup in Memcache, not in the Cookie.
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