[DEP0066] DeprecationWarning: OutgoingMessage.prototype._headers is deprecated

[khteh]

Bump into the following deprecation warning in the following code snippet:

healthchecks.get('/live', function (req, res, next) {
  res.send('OK')
});

[nodejsrestapi-1] (node:1) [DEP0066] DeprecationWarning: OutgoingMessage.prototype._headers is deprecated 
[nodejsrestapi-1]     at ServerResponse.writeHead (/app/node_modules/spdy/lib/spdy/response.js:18:12) 
[nodejsrestapi-1]     at ServerResponse.writeHead (/app/node_modules/on-headers/index.js:44:26) 
[nodejsrestapi-1]     at ServerResponse.writeHead (/app/node_modules/on-headers/index.js:44:26) 
[nodejsrestapi-1]     at ServerResponse.writeHead (/app/node_modules/on-headers/index.js:44:26) 
[nodejsrestapi-1]     at ServerResponse._implicitHeader (node:_http_server:287:8) 
[nodejsrestapi-1]     at ServerResponse.end (/app/node_modules/compression/index.js:103:14) 
[nodejsrestapi-1]     at ServerResponse.send (/app/node_modules/express/lib/response.js:232:10) 
[nodejsrestapi-1]     at file:///app/src/webapi/routes/healthchecks.js:23:9 
[nodejsrestapi-1]     at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5) 
[nodejsrestapi-1]     at next (/app/node_modules/express/lib/router/route.js:144:13)

"express": "^4.18.1",
Node: v18.7.0

[dougwilson]

Hello, and sorry for your issue. It seems you may have opened the issue on the wrong module. According to your included stack trace, the spdy module is accessing the deprecated property, not the express module:

https://github.com/spdy-http2/node-spdy/blob/661b14a8db40a76a9a4842fc12ca8908f989cfd9/lib/spdy/response.js#L18

spdy-http2/node-spdy#382

spdy-http2/node-spdy#367