[MARMOTTA-585] SPARQL pessimistically rejects first ctype in Accept header

• Type: Bug
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.3.0
• Assignee: Unassigned
• Reporter: Tom Johnson
• Created: 14/Jan/15 19:32
• Updated: 14/Jan/15 19:32

Description

When more than one Accept header is sent, the SPARQL server rejects the request with "no result format specified or unsupported result format" if the first one is not supported.

For example, the first two requests succeed but the third fails:

`curl -v -H "Accept: text/n3" http://localhost:8983/marmotta/sparql/select?query="CONSTRUCT+%7B+%3Fs+%3Fp+%3Fo+.%7D+WHERE%7B+%3Fs+%3Fp+%3Fo+.+%7D"`

`curl -v -H "Accept: text/n3, text/plain" http://localhost:8983/marmotta/sparql/select?query="CONSTRUCT+%7B+%3Fs+%3Fp+%3Fo+.%7D+WHERE%7B+%3Fs+%3Fp+%3Fo+.+%7D"`

`curl -v -H "Accept: text/plain, text/n3" http://localhost:8983/marmotta/sparql/select?query="CONSTRUCT+%7B+%3Fs+%3Fp+%3Fo+.%7D+WHERE%7B+%3Fs+%3Fp+%3Fo+.+%7D"`

This is a problem, for example, for the Ruby SPARQL::Client, which adds supported serializations to the Accept headers when their respective parsers are loaded. See workaround, here: https://github.com/dpla/rdf-marmotta/pull/5/files