The "/whatis" page:

Typical usage:

/artifact/HASH
/whatis/HASH
/file/NAME
/docfile/NAME

Additional query parameters:

ln
- show line numbers
ln=N
- highlight line number N
ln=M-N
- highlight lines M through N inclusive
ln=M-N+Y-Z
- highlight lines M through N and Y through Z (inclusive)
verbose
- show more detail in the description
brief
- show just the document, not the metadata. The /docfile page is an alias for /file?brief
download
- redirect to the download (artifact page only)
name=NAME
- filename or hash as a query parameter
filename=NAME
- alternative spelling for "name="
fn=NAME
- alternative spelling for "name="
ci=VERSION
- The specific check-in to use with "name=" to identify the file.
txt
- Force display of unformatted source text
hash
- Output only the hash of the artifact

The /artifact page show the complete content of a file identified by HASH. The /whatis page shows only a description of how the artifact is used. The /file page shows the most recent version of the file or directory called NAME, or a list of the top-level directory if NAME is omitted.

For /artifact and /whatis, the name= query parameter can refer to either the name of a file, or an artifact hash. If the ci= query parameter is also present, then name= must refer to a file name. If ci= is omitted, then the hash interpretation is preferred but if name= cannot be understood as a hash, a default "tip" value is used for ci=.

For /file, name= can only be interpreted as a filename. As before, a default value of "tip" is used for ci= if ci= is omitted.