HTTP headers | Content-Encoding

The HTTP headers Content-encoding is used to compress the media type. It informers the server which encoding the user will supported. It sends the information to the Accept-encoding. The server selects any one of the proposals, uses it and informs the client of its choice with the Content-Encoding response header.

Content-Encoding: gzip | compress | deflate | br| identity

Note: Multiple algorithms can also be applied.


  • gzip: It uses Lempel-Ziv coding (LZ77), with a 32-bit CRC format. It is the original format of UNIX gzip program.
  • compress: It uses Lempel-Ziv-Welch (LZW) algorithm. Due to patent issue, many modern browsers don’t support this type of content-encoding.
  • deflate: This format uses zlib structure with deflate compression algorithm.
  • br: It is a compression format using the Brotli algorithm.
  • identity: It is used to indicate that there is no compression.

You can check how good your Accept-Encoding and Content-Encoding is working on this site.


  • Single Compression:
    Content-Encoding: gzip
    Content-Encoding: compress
  • Multiple Compression:
    Content-Encoding: gzip, compress
  • To check the Content-Encoding in action go to Inspect Element -> Network check the request header for Content-Encoding like below, Content-Encoding is highlighted you can see.

    Supported Browsers: The browsers compatible with HTTP headers Content-Encoding are listed below:

    • Google Chrome
    • Internet Explorer
    • Firefox
    • Safari
    • Opera
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