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104 lines
2.9 KiB
Markdown
104 lines
2.9 KiB
Markdown
Compy
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=====
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Compy is an HTTP/HTTPS forward proxy with content compression/transcoding capabilities.
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One use case is to reduce bandwidth usage when browsing on limited mobile broadband connection.
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Features:
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---------
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- HTTPS proxy (encrypted connection between client and proxy)
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- man in the middle support (compress HTTPS traffic)
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- HTTP2 support (over TLS)
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- Brotli and gzip compression
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- transcode animated GIFs to static images
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- transcode JPEG images to desired quality using libjpeg
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- transcode PNG and JPEG images to WebP
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- HTML/CSS/JavaScript minification
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Installation
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------------
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```
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go get github.com/barnacs/compy
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```
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### HTTPS
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To use the proxy over HTTPS, you will need a certificate for your host. If you don't already have one, you can get one for [free](https://letsencrypt.org/) or you can generate a self-signed cert by running:
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```
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openssl req -x509 -newkey rsa:2048 -nodes -keyout cert.key -out cert.crt -days 3650 -subj '/CN=<your-domain>'
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```
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then visit the proxy URL and confirm that you trust your own certificate
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To connect to the proxy over TLS, you will need to supply a PAC (proxy auto-config) file to the browser, as most of them do not expose this option to the UI directly. Example:
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```javascript
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function FindProxyForURL(url, host) {
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if (url.substring(0, 5) == 'http:' || url.substring(0, 6) == 'https:') {
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return "HTTPS <your-domain>:9999";
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}
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return "DIRECT";
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}
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```
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This tells the browser to fetch HTTP and HTTPS URLs via the HTTPS proxy and for all other schemas, e.g., WebSocket, connect directly.
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Set the path to this file in the browser UI and you're good to go.
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### MitM
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To enable man-in-the-middle support, you will need to generate a root cert to sign all the certs generated by the proxy on the fly:
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```
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openssl req -x509 -newkey rsa:2048 -nodes -keyout ca.key -out ca.crt -days 3650 -subj '/CN=<your-domain>'
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```
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and add it to your client (browser) as a trusted certificate authority
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Usage
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-----
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To run a simple http forward proxy:
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```
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compy
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```
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To run it over TLS:
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```
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compy -cert cert.crt -key cert.key
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```
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With man in the middle support:
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```
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compy -ca ca.crt -cakey ca.key
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```
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Probably the best option is to run it with both TLS and MitM support, combining the two:
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```
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compy -cert cert.crt -key cert.key -ca ca.crt -cakey ca.key
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```
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You can also specify the listen port (defaults to 9999):
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```
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compy -host :9999
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```
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For compression, transcoding and minification options, see `compy --help`
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References
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----------
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* [Google Flywheel](https://www.usenix.org/conference/nsdi15/technical-sessions/presentation/agababov) - NSDI 2015 paper discussing techniques used by Chrome data saver
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* [Mozilla Janus](https://wiki.mozilla.org/Mobile/Janus) - now-defunct experiment similar to compy
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* [Ziproxy](https://en.wikipedia.org/wiki/Ziproxy) - older approach similar to compy
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Credits
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-------
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https://github.com/pixiv/go-libjpeg
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https://github.com/tdewolff/minify
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License
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-------
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ISC, see LICENSE
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