CloudFront behaviour Path pattern matching
In my CloudFront I have a behaviour with Path pattern /no/app* but I have a weird situation.
When the URL is /no/.%2fapp then it is matched by the above pattern.
Tbh I have no idea why this URL is used by customers, but it is equivalent to /no/./app which is automatically normalized by a browser to /no/app but when it is not encoded then the browser is passing it as it is.
Do you have any idea why it happens?
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I got an answer from AWS Support:
Section 1.2.1 - Transcription
The design of URL encoding is to make sure all characters used in URI are in the range of US-ASCII.
Section 2.4 - When to Encode or Decode
When a URI is dereferenced, it need to be decoded.
Section 5.2.4 - Remove Dot Segments
If the input buffer begins with a prefix of "/./" or "/.", where "." is a complete path segment, then replace that prefix with "/" in the input buffer.
Even if the URI is normalized for matching, Lambda@Edge gets the original request URI.
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