Issue Summary

If the <Confluence_Home>/temp folder is a symlink to somewhere else PDF exports lead to a Page Not Found error

Steps to Reproduce

1. Install Confluence
2. symlink /temp from inside the home folder to somewhere else like follows,

   lrwxr-xr-x   1 haftab  staff    16 21 Aug 14:20 temp -> /tmp/temp_backup
   

3. Export a page as PDF

Expected Results

The page should be exported and downloaded by the browser

Actual Results

Confluence shows a Page Not Found error

Diagnosis

Capturing a HAR file will show that PDF export action is redirecting to a URL

        "request": {
          "method": "GET",
          "url": "https://website.com:9443/c740/spaces/flyingpdf/pdfpageexport.action?pageId=5963785",
          "httpVersion": "HTTP/1.1",
.
        "response": {
          "status": 302,
.
          "redirectURL": "/c740/download/private/tmp/temp_backup/pdfexport-20200821-210820-1427-5/MS-Page11-210820-1427-6.pdf?contentType=application/pdf",

Though, this redirected URL is not accessible.

    "request": {
          "method": "GET",
          "url": "https://website.com:9443/c740/download/private/tmp/temp_backup/pdfexport-20200821-210820-1427-5/MS-Page11-210820-1427-6.pdf?contentType=application/pdf",
.
        "response": {
          "status": 404,

Workaround

The PDF export is still available in the <Confluence_Home>/temp folder and can be fetched manually. Or, symlink should be removed