Data compression is the process of reducing size of a data file. Compression can be either lossy or lossless. In lossless the bits are reduced by identifying and eliminating statistical redundancy. Lossy compression removes unnecessary information.
HTTP compression (wiki)
HTTP data is compressed before it is sent from the server: compliant browsers will announce what methods are supported to the server before downloading the correct format. The most common compression schemes include gzip and Deflate
GZip vs Deflate
GZip is simply deflate with checksum and header/footer. Deflate is faster. SO - Why use deflate instead of gzip for text files served by Apache?.
Resources
Data compression - wikipedia
http://www.fastly.com/blog/best-practices-for-using-the-vary-header/
HTTP compression (wiki)
HTTP data is compressed before it is sent from the server: compliant browsers will announce what methods are supported to the server before downloading the correct format. The most common compression schemes include gzip and Deflate
GZip vs Deflate
GZip is simply deflate with checksum and header/footer. Deflate is faster. SO - Why use deflate instead of gzip for text files served by Apache?.
Resources
Data compression - wikipedia
http://www.fastly.com/blog/best-practices-for-using-the-vary-header/
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