[jira] [Commented] (JENA-743) Should User-Agent be removed from the Vary header?

["Rob Vesse (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054705#comment-14054705 ] 

Rob Vesse commented on JENA-743:
--------------------------------

Apart from {{User-Agent}} which does seem unnecessary all the others look valid:

- {{Accept}} is used to determine which format to send responses to the user in, particularly important for interacting with non-browser clients e.g. APIs, SPARQL interfaces etc
- {{Accept-Encoding}} can cause Fuseki to use Gzip compression on the responses, this can improve performance in environments where very large results are produced
- {{Accept-Charset}} is important since most formats are defined to be UTF-8 only, asking for them as anything else can be considered invalid and legitimately result in a {{406 Not Acceptable}}

> Should User-Agent be removed from the Vary header?
> --------------------------------------------------
>
>                 Key: JENA-743
>                 URL: https://issues.apache.org/jira/browse/JENA-743
>             Project: Apache Jena
>          Issue Type: Question
>          Components: Jena
>    Affects Versions: Fuseki 1.1.0
>         Environment: Jena:       VERSION: 2.12.0-SNAPSHOT
> Jena:       BUILD_DATE: 2014-07-06T07:58:00+0000
> ARQ:        VERSION: 2.12.0-SNAPSHOT
> ARQ:        BUILD_DATE: 2014-07-06T07:58:00+0000
> RIOT:       VERSION: 2.12.0-SNAPSHOT
> RIOT:       BUILD_DATE: 2014-07-06T07:58:00+0000
> TDB:        VERSION: 1.1.0-SNAPSHOT
> TDB:        BUILD_DATE: 2014-07-06T07:58:00+0000
>            Reporter: Sarven Capadisli
>            Priority: Minor
>             Fix For: Fuseki 1.1.0
>
>
> Multiple questions, and possible issues to create from here:
> * At the moment, Fuseki Vary headers are: "Accept,Accept-Encoding,Accept-Charset,User-Agent". Isn't this a bit excessive?
> * Do they all currently play a role in creating a response? For those that do not, should they be removed? (I can't think of a reason why User-Agent is included for instance)
> * Can the Vary headers be set conditionally or configurable?



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