safe-set-header

🤯 make ServerResponse.setHeader idempotent for HttpServer

require('safe-set-header')();

Will not try to set headers after they were sent. For example, if a middleware has already sent relevant response headers

Example of errors that should not happen:

• ERR_HTTP2_HEADERS_AFTER_RESPOND (Cannot specify additional headers after response initiated)
• ERR_HTTP_HEADERS_SENT (Cannot set headers after they are sent to the client)

log cases where this happens

[optional] Pass in a log function. The log function will be called with an error object

require('safe-set-header')({log: console.log});