Heroku now collects user browser data via Network Error Logging

Change effective on 25 September 2023

Heroku now collects select user browser data via Network Error Logging (NEL). NEL provides Heroku with more insights to act before an incident starts to negatively impact customers. NEL is a W3C standard (draft) that defines how to measure performance characteristics of web applications in real-time with data from end users.

Several browsers implement the NEL standard, including Google Chrome and Microsoft Edge. On the server, NEL works by annotating HTTP responses with headers that instruct the browser to submit reports to an endpoint that aggregates the information and processes connectivity and latency metrics. Heroku conducts NEL consistent with the Salesforce Privacy Statement. For more info about HTTP headers, see HTTP Routing.