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https://issues.apache.org/jira/browse/MARMOTTA-505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005867#comment-14005867
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Chris Beer commented on MARMOTTA-505:
-------------------------------------
Sure. The immediate problem I'm trying to solve is working with id.loc.gov
linked data service's known label API
(http://id.loc.gov/techcenter/searching.html#knownLabel).
With that API, you give it a term name URI (e.g.
http://id.loc.gov/authorities/label/orchids) and it will redirect you to an
authority URI (http://id.loc.gov/authorities/subjects/sh85095334). The HTTP
response has two headers that I'd like to use:
X-PrefLabel:Orchids
X-URI:http://id.loc.gov/authorities/subjects/sh85095334
The X-PrefLabel header would just be a (premature) performance optimization on
my part, because at least some of the time I don't need the full RDF response
in the first place.
The X-URI header is (I believe) essential to parsing their RDF response. The
graph they produce at http://id.loc.gov/authorities/subjects/sh85095334.rdf
uses the X-URI as the subject of the graph of interest. In combination with
MARMOTTA-500 and a pull request I'm still developing, I can use this
information to retrieve the data I need. (Some may rightly argue that loc.gov's
serialization leaves something to be desired, but I'm sure there are other
less-than-perfect implementation in the wild too).
There are a couple other use cases that I'd find HTTP header information of
interest, including following the object of a triple to a non-linked data
resource and being able to pull some basic information from common headers
(content type, last modified and/or an ETag) or some implementation-defined
headers. There may also be some interesting Link: information, but I'm not sure
how to parse that out in an actionable way (e.g. rel="canonical")
> Add a LDPath function to access response headers, which may contain useful
> information
> --------------------------------------------------------------------------------------
>
> Key: MARMOTTA-505
> URL: https://issues.apache.org/jira/browse/MARMOTTA-505
> Project: Marmotta
> Issue Type: New Feature
> Components: LDCache, LDClient, LDPath
> Affects Versions: 3.2.1
> Reporter: Chris Beer
> Assignee: Jakob Frank
> Fix For: 3.3.0
>
>
> Some linked data resources that I'm requesting have important information in
> their HTTP headers. I would like to access those headers from an LDPath
> program.
> To do so, I expanded the LDCache and LDClient APIs to support exposing
> headers to a newly created LDPath function.
> {code}
> content_type = fn:header("Content-Type") :: xsd:string ;
> /* content_type = {application/rdf+xml} */
> {code}
> https://github.com/apache/marmotta/pull/6
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