Receiving "http2: no cached connection was available" errors from HTTP/2

[dr...@pendo.io]

Our platform (Google App Engine Flexible Environments) recently upgraded from Go 1.5 to 1.6, and now I'm receiving frequent errors when opening a large number of HTTP(/2) connections to a REST endpoint: "http2: no cached connection was available".

I've done a bit of spelunking in src/net/http/h2_bundle.go, but I'm out of my depth in there. Any help in diagnosing/correcting this issue would be appreciated.

Thanks,

- Drew

[Alex B]

I get this too, not sure if it negatively affects anything