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https://issues.apache.org/jira/browse/HTTPCLIENT-1952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16710571#comment-16710571
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Antony Bowesman commented on HTTPCLIENT-1952:
---------------------------------------------
I agree with Michael, that having an empty header is a valid use case. I've
dealt with projects where they used headers as flags. In one library I used, I
had to make that header a single space, as it removed headers that had no value.
The ABNF in RFC7230 also defines the field value as
field-value = *( field-content / obs-fold )
which would indicate that empty values are valid.
> Allow default User Agent to be disabled
> ---------------------------------------
>
> Key: HTTPCLIENT-1952
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1952
> Project: HttpComponents HttpClient
> Issue Type: Improvement
> Components: HttpCache
> Affects Versions: 4.5.6
> Reporter: Antony Bowesman
> Priority: Minor
>
> There is no way to disable the User-Agent header. In any kind of micro
> service architecture, where UA header is irrelevant, the header cannot be
> removed.
> This has been seen as an issue using JMeter, see link
> [https://bz.apache.org/bugzilla/show_bug.cgi?id=62977#c1]
> See comment #1 there from [~michael-o]
>
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