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Last active August 29, 2015 14:24
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redirect-case-problem.md

Problem:

  1. User requests /My-Page with a completely cold cache
  2. Global Redirect module says to redirect to /my-page instead with the "Case Sensitive URL Checking" enabled by default.
  3. Drupal core (patched with https://www.drupal.org/node/1678348) includes headers that allow this redirect to be cached
  4. Page cache stores the request for /My-Page with the header Location: /my-page
  5. User requests /my-page with a now-warm cache
  6. Page cache response includes header to redirect the current request to /my-page, which creates an infinite redirect loop

This happens when using both Drupal's native page cache as well as Akamai. The cache_page.cid column is a VARCHAR, which in MySQL is a non-binary string and hence, it is case-insensitive by default. Akamai by default is case-insensitive.

Possible solutions:

  • Enable case-sensitivity in Akamai's rules for storing and retrieving?
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