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https://issues.apache.org/jira/browse/NIFI-1620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333304#comment-15333304
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Pierre Villard commented on NIFI-1620:
--------------------------------------

Thanks for the review [~adamtaft]! I'll update the PR to take into account your 
comments.

Regarding the proposition to not transmit Content-Type when there is no 
content, I think this could possibly break backward compatibility in case some 
applications are expecting content type in any case (even with an empty 
content), no?

I don't care if this is postponed, there is no blocking issue on my side but, 
just as a remark, some flows I have worked on seem to be impossible without 
this change (the main one is probably the one dealing with the Dropbox API).

> Allow empty Content-Type in InvokeHTTP processor
> ------------------------------------------------
>
>                 Key: NIFI-1620
>                 URL: https://issues.apache.org/jira/browse/NIFI-1620
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>    Affects Versions: 0.5.1
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
>             Fix For: 1.0.0, 0.7.0
>
>
> External API could expect a POST request without a Content-Type property or 
> at least with this property empty:
> *Error example:*
> {quote}
> You provided a non-empty HTTP "Content-Type" header ("application/json").  
> This API function requires that the header be missing or empty.
> {quote}



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