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https://issues.apache.org/jira/browse/SPARK-31697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17106035#comment-17106035
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Apache Spark commented on SPARK-31697:
--------------------------------------

User 'sarutak' has created a pull request for this issue:
https://github.com/apache/spark/pull/28519

> HistoryServer should set Content-Type
> -------------------------------------
>
>                 Key: SPARK-31697
>                 URL: https://issues.apache.org/jira/browse/SPARK-31697
>             Project: Spark
>          Issue Type: Bug
>          Components: Web UI
>    Affects Versions: 3.1.0
>            Reporter: Kousuke Saruta
>            Assignee: Kousuke Saruta
>            Priority: Minor
>
> I noticed that we will get html as plain text when we access to wrong URLs on 
> HistoryServer.
> {code:java}
> <html>
>       <head>
>         <meta http-equiv="Content-type" content="text/html; 
> charset=utf-8"/><meta name="viewport" content="width=device-width, 
> initial-scale=1"/><link rel="stylesheet" href="/static/bootstrap.min.css" 
> type="text/css"/><link rel="stylesheet" 
> href="/static/vis-timeline-graph2d.min.css" type="text/css"/><link 
> rel="stylesheet" href="/static/webui.css" type="text/css"/><link 
> rel="stylesheet" href="/static/timeline-view.css" type="text/css"/><script 
> src="/static/sorttable.js"></script><script 
> src="/static/jquery-3.4.1.min.js"></script><script 
> src="/static/vis-timeline-graph2d.min.js"></script><script 
> src="/static/bootstrap.bundle.min.js"></script><script 
> src="/static/initialize-tooltips.js"></script><script 
> src="/static/table.js"></script><script 
> src="/static/timeline-view.js"></script><script 
> src="/static/log-view.js"></script><script 
> src="/static/webui.js"></script><script>setUIRoot('')</script>
>         
>         <link rel="shortcut icon" 
> href="/static/spark-logo-77x50px-hd.png"></link>
>         <title>Not Found</title>
>       </head>
>       <body>
>         <div class="container-fluid">
>           <div class="row">
>             <div class="col-12">
>               <h3 style="vertical-align: middle; display: inline-block;">
>                 <a style="text-decoration: none" href="/">
>                   <img src="/static/spark-logo-77x50px-hd.png"/>
>                   <span class="version" style="margin-right: 
> 15px;">3.1.0-SNAPSHOT</span>
>                 </a>
>                 Not Found
>               </h3>
>             </div>
>           </div>
>           <div class="row">
>             <div class="col-12">
>               <div class="row">Application local-1589239 not found.</div>
>             </div>
>           </div>
>         </div>
>       </body>
>     </html> {code}
>  
> The reason is Content-Type not set.
> {code:java}
> HTTP/1.1 404 Not Found
> Date: Wed, 13 May 2020 06:59:29 GMT
> Cache-Control: no-cache, no-store, must-revalidate
> X-Frame-Options: SAMEORIGIN
> X-XSS-Protection: 1; mode=block
> X-Content-Type-Options: nosniff
> Content-Length: 1778
> Server: Jetty(9.4.18.v20190429) {code}



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