dongjoon-hyun commented on PR #626:
URL: https://github.com/apache/spark-website/pull/626#issuecomment-3267310412

   For `isnan.html` and `isNaN.html`, I confirmed that. 
   > But seems for is nan, they are linked to different pages, so if you open 
the two isNaN and isnan html in the browser, they will forward-link to 
different location. So I wonder if we remove isnan.html, we will break the 
current link. Although isNaN.html will work and forward link, but it will link 
to different location.
   
   I was confused because the HTTP PATH component part is case-sensitive as you 
pointed out.
   
   ```
   $ curl https://spark.apache.org/docs/3.5.6/api/R/reference/isnan.html
   <html>
     <head>
       <meta http-equiv="refresh" 
content="0;URL=https://spark.apache.org/docs/3.5.6/api/R/reference/column_nonaggregate_functions.html";
 />
       <meta name="robots" content="noindex">
       <link rel="canonical" 
href="https://spark.apache.org/docs/3.5.6/api/R/reference/column_nonaggregate_functions.html";>
     </head>
   </html>
   
   $ curl https://spark.apache.org/docs/3.5.6/api/R/reference/isNaN.html
   <html>
     <head>
       <meta http-equiv="refresh" 
content="0;URL=https://spark.apache.org/docs/3.5.6/api/R/reference/columnfunctions.html";
 />
       <meta name="robots" content="noindex">
       <link rel="canonical" 
href="https://spark.apache.org/docs/3.5.6/api/R/reference/columnfunctions.html";>
     </head>
   </html>
   ```
   
   Let me close this PR.


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