Encountered on an older versions of Go and go-openapi, but reproduced it with current versions:
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x28 pc=0x90de85]

goroutine 157 [running]:
github.com/go-openapi/runtime.(*peekingReader).Read(0xc000b7f7c0?, {0xc0005a1d3e?, 0x740a7e?, 0xc0005597a0?})
C:/Users/devbuild/go/pkg/mod/github.com/go-openapi/runtime@v0.26.0/request.go:99 +0x25
net/http.(*transferWriter).probeRequestBody.func1({0x28c3bab8, 0xc000171c80})
C:/Script/Go-1.20/src/net/http/transfer.go:211 +0x6e
created by net/http.(*transferWriter).probeRequestBody
C:/Script/Go-1.20/src/net/http/transfer.go:208 +0x12e

Panics in last line of peekingReader.Read because p.underlying is nil:
func (p *peekingReader) Read(d []byte) (int, error) { if p == nil { return 0, io.EOF } return p.underlying.Read(d) }

The only place I can find p.underlying set to nil is in Close:
func (p *peekingReader) Close() error { p.underlying = nil if p.orig != nil { return p.orig.Close() } return nil }

Request: Can you please add a check to peekingReader.Read() to return an error when p.underlying is nil? Nested/hidden interfaces and goroutines can make it very difficult to follow the trail of breadcrumbs to determine the root cause, and an error would be so much more friendly than a panic here. Perhaps io.ErrUnexpectedEOF, as it is unexpected?

TIA