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What is content encoding deflate?
In HTTP/1.1, Content-encoding: deflate actually refers to the DEFLATE compression algorithm, as defined by RFC 1951, wrapped in the zlib data format, as defined by RFC 1950. However some vendors just implement the DEFLATE algorithm as defined RFC 1951, completely ignoring RFC 1950 (no zlib headers).
What does accept-encoding gzip deflate mean?
compressed content
The browser sends a header telling the server it accepts compressed content (gzip and deflate are two compression schemes): Accept-Encoding: gzip, deflate. The server sends a response if the content is actually compressed: Content-Encoding: gzip.
What is difference between gzip and deflate?
“gzip” is the gzip format, and “deflate” is the zlib format. They should probably have called the second one “zlib” instead to avoid confusion with the raw deflate compressed data format.
What does content encoding mean?
Content encoding is mainly used to compress the message data without losing information about the origin media type. Note that the original media/content type is specified in the Content-Type header, and that the Content-Encoding applies to the representation, or “coded form”, of the data.
What is zlib deflate?
zlib is a software library used for data compression. zlib was written by Jean-loup Gailly and Mark Adler and is an abstraction of the DEFLATE compression algorithm used in their gzip file compression program. zlib is also a crucial component of many software platforms, including Linux, macOS, and iOS.
Do you have to specify a gzip or deflate encoding?
The Accept-Encoding header must be present in the request, and it must specify the gzip, deflate, or both gzip and deflate encoding schemes. The encoding scheme specified in the Content-Encoding header must match one of the encoding schemes specified in the Accept-Encoding header.
What do I need to know about content encoding?
The encoding scheme specified in the Content-Encoding header must match one of the encoding schemes specified in the Accept-Encoding header. The Content-Encoding header in the response specifies only one encoding scheme.
When to strip the Content-Encoding header from the response?
WinINet strips the content-encoding header from the response when content decoding is successfully performed. Applications are expected to handle content decoding regardless of whether the decoding option is enabled or disabled when the content-encoding header is present in the response.
How to enable content decoding in Win32 apps?
To enable content decoding, the application sets the decoding option requesting that WinINet perform decoding on their behalf. However, enabling decoding does not guarantee that WinINet will perform content decoding, and the application should be prepared to handle decoding.