Rob Winch 1dbd3f5906 Fix NPE in OnCommittedResponseWrapper trackContentLength (#3824)
OnCommittedResponseWrapper trackContentLength will throw a
NullPointerException when the content length passed in is null.

This commit properly tracks the null value as a length of 4.

Fixes gh-3823
2016-04-19 14:58:56 -04:00
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