* Protocol negotiation is only attempted for HTTPS URLs.
     *
     * [Protocol.HTTP_1_0] is not supported in this set. Requests are initiated with `HTTP/1.1`. If
     * the server responds with `HTTP/1.0`, that will be exposed by [Response.protocol].
     *
     * [alpn]: http://tools.ietf.org/html/draft-ietf-tls-applayerprotoneg
     * [rfc_2616]: http://www.w3.org/Protocols/rfc2616/rfc2616.html

	DryRun []string `json:"dryRun,omitempty" protobuf:"bytes,5,rep,name=dryRun"`
}

const (
	// FieldValidationIgnore ignores unknown/duplicate fields
	FieldValidationIgnore = "Ignore"
	// FieldValidationWarn responds with a warning, but successfully serve the request
	FieldValidationWarn = "Warn"
	// FieldValidationStrict fails the request on unknown/duplicate fields
	FieldValidationStrict = "Strict"
)

	// set it, only then do we transparently decode the gzip.
	addedGzip bool

	// Optional blocking chan for Expect: 100-continue (for send).
	// If the request has an "Expect: 100-continue" header and
	// the server responds 100 Continue, readLoop send a value
	// to writeLoop via this chan.
	continueCh chan<- struct{}

	callerGone <-chan struct{} // closed when roundTrip caller has returned
}