can not get X-AppEngine info from req header in 2nd generation AppEngine - google-cloud-functions

Question

I build 2 functions in GoogleCloudFunctions today, with the same code and different environment (1st gen and 2nd gen).
res.json(req.headers)
the 1st generation with X-Appengine-* in headers but 2nd generation don't have it.
1st generation res:
{
"host": "xxxxx",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:106.0) Gecko/20100101 Firefox/106.0",
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
"accept-encoding": "gzip, deflate, br",
"accept-language": "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
"forwarded": "for=\"xx.xx.xx.xx\";proto=https",
"function-execution-id": "z93h1p8dezsd",
"sec-fetch-dest": "document",
"sec-fetch-mode": "navigate",
"sec-fetch-site": "none",
"sec-fetch-user": "?1",
"traceparent": "00-c6fbb14b26a1999f7203caa810bd82bd-f4e8995eb815facc-01",
"upgrade-insecure-requests": "1",
"x-appengine-appversionid": "h~j3d1cb91ff7bbe64cp-tp/a8aa78b2557e1c923250159d17af9995:2.447902922919183830",
"x-appengine-city": "?",
"x-appengine-citylatlong": "0.000000,0.000000",
"x-appengine-country": "HK",
"x-appengine-default-version-hostname": "j3d1cb91ff7bbe64cp-tp.appspot.com",
"x-appengine-https": "on",
"x-appengine-region": "?",
"x-appengine-request-log-id": "63745ec000ff00ff035e0349af4c0001687e6a33643163623931666637626265363463702d7470000161386161373862323535376531633932333235303135396431376166393939353a32000100",
"x-appengine-timeout-ms": "599999",
"x-appengine-user-ip": "xx.xx.xx.xx",
"x-cloud-trace-context": "c6fbb14b26a1999f7203caa810bd82bd/17647523771945712332;o=1",
"x-forwarded-for": "xx.xx.xx.xx",
"x-forwarded-proto": "https",
"connection": "close"
}
2nd generation res:
{
"host": "xxxxx.run.app",
"user-agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:106.0) Gecko/20100101 Firefox/106.0",
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
"accept-language": "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
"upgrade-insecure-requests": "1",
"sec-fetch-dest": "document",
"sec-fetch-mode": "navigate",
"sec-fetch-site": "none",
"sec-fetch-user": "?1",
"x-cloud-trace-context": "7adcb5fe556c66fc94f83b6dfe62dfe6/5799981330522755859;o=1",
"traceparent": "00-7adcb5fe556c66fc94f83b6dfe62dfe6-507dac4a5db4d313-01",
"x-forwarded-for": "xxx.xxx.xxx.xxx",
"x-forwarded-proto": "https",
"forwarded": "for=\"xxx.xxx.xxx.xxx\";proto=https",
"accept-encoding": "gzip, deflate, br"
}
Could I get X-Appengine-* from 2nd generation Functions?
Thank you

Answer 1

App Engine-specific headers is not supported for second generation environment.Because Cloud Functions (2nd gen) is built on Cloud Run,you can refer to this document
As mentioned by john hanley in above comment If you want those headers, deploy on gen1.
If you think it’s a valid feature request you may raise here with a clear description.Good feature requests will solve common problems or enable new use cases.