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[Imported from Trac: page Extensions, version 7]

nejucomo 2007-10-18 17:23:02 +00:00
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Extensions.md

@ -11,6 +11,22 @@ None known yet...
## Extension Implementation Issues
### Caching Tips
Tahoe URIs may refer to either immutable or mutable content. URIs for immutable data are simple to cache by mapping the URI to the contents.
Mutability is independent of read-only capabilities. A read-only capability may refer to mutable content.
To determine the mutability of a URI, parse the second field of the URI (delimited by ':'):
* URI:CHK:... : immutable
* URI:LIT:... : immutable
* URI:DIR:... : mutable, writable
* URI:DIR-RO:... : mutable, not writable
Note: Currently all files are immutable, and all directories are mutable, but in the future the node type (file or directory) and the mutability will be independent. It's a bad idea to rely on the node type to determine mutability.
### HTTP methods
The api relies on four HTTP methods defined as per the standard `GET, POST, PUT, and DELETE`, which map intuitively to storage operations.