- <p>Network Error Logging (NEL) addresses this need by defining a mechanism enabling web applications to declare a reporting policy that can be used by the user agent to report network errors for a given origin. A web application opts into using NEL by supplying a <a>NEL</a> HTTP response header field that describes the desired <a>NEL policy</a>. This policy instructs the user agent to log information about requests to that origin, and to attempt to deliver that information to a group of endpoints previously configured using the [[[REPORTING]]. As the name implies, NEL reports are primarily used to describe <em>errors</em>. However, in order to determine <em>rates</em> of errors across different client populations, we must also know how many <em>successful</em> requests are occurring; these successful requests can also be reported via the NEL mechanism.</p>
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