zhanhb commented on issue #172: Process request range as specified in RFC 7233 URL: https://github.com/apache/tomcat/pull/172#issuecomment-504718438 Before I write unit tests, maybe I need to explain what I my PR do. [Line L559](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL559) I don't think is a good practise to referrer package visible class in another source file. [Line R602-R603](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dR602-R603) Add comment, which might be done in tomcat 10 or future release. [Line L1016-R1018](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1016-R1018) Clean the source. Might be incompatible if a user define a class extends DefaultServlet and parse the range himself with parameter or another header field. But maybe we should not consider such case. We should make the method `parseRange` meaningful and easy to maintain. [Line R1448-R1451](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dR1448-R1451) Report a full range for such as HEAD request. All other request methods should not contains a `Range` header. [Line L1464-R1473](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1464-R1473) As specified in [rfc7233#3.2](https://tools.ietf.org/html/rfc7233#section-3.2), apply strong validator on etags. (My opinion now is that this should not be applied.) [Line L1471-R1481](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1471-R1481) Our etag depends the modified time and sizeof the file. This won't change too much. [Line L1440-R1441](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1490-R1441), [L1490](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1490), [R1497](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dR1490) Make method parseRange meaningfull and easier to maintain. [Line L1491-L1492](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1491-L1492), [R1498-R1501](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dR1498-R1501) [rfc7233#3.1](https://tools.ietf.org/html/rfc7233#section-3.1) says that we must ignore a Range header field that contains a range unit it does not understand. Not change too much for a comman used user agent won't send such header "Range: none". [Line L1508-R1519](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1508-R1519), [L1517-R1528](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1517-R1528), [L1530-R1544](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1530-R1544), [L1550-R1564](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1530-R1564), [L1570-R1579](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dL1570-R1579) no change, just clean the source. [Line R1533-R1541](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395dR1533-R1541), [L1543-R1564](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395d#L1543-R1564), [L2664-R2673](https://github.com/apache/tomcat/pull/172/files#diff-355391a6aff99c525e8cd9165efd395d#L2664-R2673) For a request who is requesting a single range, we response a modified range range than 416. For a request who is requesting multiple ranges, we will remove some unsatisfiable ranges and response remain ranges. Behaviour might be incompative we will reponse a single range style for multiple range requests. For a put request, original implementation will be OK if such request is sent "Content-Range: 1-5/4". The meaning for method `Range.validate` is `isSatisfiable` for GET method, `isValid` for PUT method.
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