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https://issues.apache.org/jira/browse/CALCITE-765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14597545#comment-14597545
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Lukas Lalinsky commented on CALCITE-765:
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https://github.com/apache/incubator-calcite/pull/96

> RPC server returns JSON data with Content-Type set to text/html
> ---------------------------------------------------------------
>
>                 Key: CALCITE-765
>                 URL: https://issues.apache.org/jira/browse/CALCITE-765
>             Project: Calcite
>          Issue Type: Improvement
>    Affects Versions: 1.4.0-incubating
>            Reporter: Lukas Lalinsky
>            Assignee: Julian Hyde
>            Priority: Minor
>
> The server currently always sets Content-Type to text/html, even though it's 
> actually returning JSON data. That makes it hard to distinguish JSON response 
> from a Jetty-generated error page. I suggest changing it to application/json 
> (RFC 4627). I'm experimenting with writing a Python client for the RPC and 
> I'd like to generate better exceptions than "something failed". How to handle 
> error in the RPC is a discussion for another ticket, but this seems like the 
> first obvious step.



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