large http payload issue

[umutbasal]

While trying the project, I made an http request with a large payload with post and got an error like
{"error":{"code":400,"message":"error reading body params '*': proto: syntax error (line 2:12): invalid character '\\x00' in string","details":null,"Body":"","Header":null,"Errors":null}}%

this line needs all bytes to unmarshall

gapic-showcase/util/genrest/goviewcreator.go

Line 128 in 8186605

source.P(" if err := resttools.FromJSON().Unmarshal(rBytes, %s); err != nil {", handler.RequestVariable)

after some debugging and reproducing bug on simple go server i've found out this, giving r.body directly to teereader wont be able to read all data.

gapic-showcase/util/genrest/goviewcreator.go

Line 121 in 8186605

source.P(" bodyReader := io.TeeReader(r.Body, &jsonReader)")

red dots are null bytes \x00

TeeReader returns a Reader that writes to w what it reads from r. All reads from r performed through it are matched with corresponding writes to w. There is no internal buffering - the write must complete before the read completes. Any error encountered while writing is reported as a read error.

https://cs.opensource.google/go/go/+/go1.20.5:src/io/io.go;l=603