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https://issues.apache.org/jira/browse/SOLR-12282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16458887#comment-16458887
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Markus Schuch commented on SOLR-12282:
--------------------------------------

Good point. Browser support for CORS looks way better than last time i checked 
([https://caniuse.com/#feat=cors).]

> JSONResponseWriter should return Content-Type application/javascript for 
> JSONP requests
> ---------------------------------------------------------------------------------------
>
>                 Key: SOLR-12282
>                 URL: https://issues.apache.org/jira/browse/SOLR-12282
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: Response Writers
>            Reporter: Markus Schuch
>            Priority: Minor
>         Attachments: SOLR-12282.patch
>
>
> The JSONResponseWriter handles two purposes:
>  * writing JSON responses (wt=json)
>  * writing JSONP responses, namely JSON responses wrapped by a JavaScript 
> function (wt=json&json.wrf=myFunction)
> The response writer returns the same Content-Type in both cases. (default: 
> application/json)
> But for JSONP the correct Content-Type would be "application/javascript".
> The response type is configurable, but it is currently not possible to return 
> the correct Content-Type in both cases with one configuration at the same 
> time.
> The attached patch changes the default Content-Type to 
> {{application/javascript; charset=utf-8}} for responses with wrapper 
> functions (JSONP). If param {{content-type}} is configured, this Content-Type 
> will be returned for both JSON and JSONP to ensure backward compatibility.



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