rswiki-book/src/JAGGRAB-Protocol.md

\[Category Cache

== Introduction ==

The JAGGRAB protocol is used to 'grab' cache files from the file server and download them.

It is a text-based protocol, similar to HTTP/0.9, and the client will fall back to HTTP if JAGGRAB is unavailable. This generally happens in unsigned mode and helps users who are behind firewalls.

== Request format ==

A request is simply the text JAGGRAB, a space, the path to the file and a newline character. Therefore, it is very similar to a HTTP/0.9 GET request.

JAGGRAB /path/to/file

=== New engine ===

In (perhaps all) new engine clients, the client prefixes the JAGGRAB request line with a single byte (value 17).

== Response format ==

The response is simply the raw file data. Once the response is sent, the connection is closed.

== Files ==

There are a number of files which map to files in the cache.

• '''/crc''' - the CRC table
• '''/title''' - cache 0, file 1
• '''/config''' - cache 0, file 2
• '''/interface''' - cache 0, file 3
• '''/media''' - cache 0, file 4
• '''/versionlist''' - cache 0, file 5
• '''/textures''' - cache 0, file 6
• '''/wordenc''' - cache 0, file 7
• '''/sounds''' - cache 0, file 8

NOTE: the client will usually postfix these with random numbers, so when checking for the file only the start of the string should be examined: not the whole one. This is to help avoid caches when these files are fetched over HTTP.
NOTE: The crc is postfixed with the client revision