args.go
func (a *Args) Peek(key string) []byte {
	return peekArgStr(a.args, key)
}
func (a *Args) Peek(key string) []byte {
	return peekArgStr(a.args, key)
}
func ( a * Args ) Peek ( key string ) [ ] byte { return peekArgStr ( a . args , key ) }
// Peek returns query arg value for the given key.
//
// Returned value is valid until the next Args call.
Peek returns query arg value for the given key . Returned value is valid until the next Args call .