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Shared Dictionary Compression over HTTP
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Shared Dictionary Compression over HTTP
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Shared Dictionary Compression over HTTP
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Abstract
Table of Contents:
Related Technologies and Background
Proposal: Shared Dictionary Compression over HTTP
Syntax
Dictionary Description
Syntax of Dictionary Metadata
A complete dictionary definition then has this format:
dictionary-definition = dictionary-metadata payload
Dictionary Scope
Dictionary Identifier
Differences between Dictionaries and Cookies
User Agent / Server Interaction Description
avail-dictionary-header = "Avail-Dictionary" ":" 1#dictionary-client-id
Server Role in HTTP Response Generation
sdch-not-used-header = "X-SDCH-Encode" ":" "0"
get-dictionary-header = "Get-Dictionary" ":" 1#partial-url
User Agent Role in HTTP Response Handling
The dictionary URL is defined as follows:
SDCH-Encoded Response Body
Examples
"Help pages" dictionary
Example 1: Initial Interaction, User Agent has No Dictionaries
2. server's response
HTTP/1.1 200 OK
2. server's response
HTTP/1.1 200 OK
Example 3: User Requests Page AND User Agent Has Already Downloaded the Dictionary
2. server's response
HTTP/1.1 200 OK
Example 4: User Requests with Multiple Dictionaries
2. server's response
HTTP/1.1 200 OK
Implementation Considerations
Implementation Limits
Dictionary Downloading
Data Integrity
Data tampered by Proxy
Dictionary mismatch
Data corruption / malicious attacks
Response Caching
Intermediate Caches
Dictionary Caching
Intermediate Caches
Future Directions
Current Status and Updates
Acknowledgements
Appendix: VCDIFF Encoding Format and SDCH
Interleaved format
Adler32 checksum
Version header byte (Header4)
VCD_TARGET flag and target COPY instructions not allowed for SDCH
References
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