General-purpose lossless compression algorithm that compresses data using a variant of the LZ77 algorithm, Huffman coding, and 2nd order context modeling.
HTTP Substitutions Filter
Filter module which can do both regular expression and fixed string substitutions on response bodies.
Crop, resize, rotate, and perform other transforms on JPEG, GIF, and PNG images.
Transform XML responses using one or more XSLT stylesheets.
Set and clear input and output headers (extend the NGINX core Headers module).
Implement numerous additional set_* directives (extend NGINX core Rewrite module).