implemented HTTP 1.0/1.1 server

internal/http/errors.go

@@ -0,0 +1,14 @@
+package http
+
+type HttpError struct {
+	Status StatusCode
+	Msg    string
+}
+
+func (e *HttpError) Error() string {
+	return e.Status.String() + ": " + e.Msg
+}
+
+func NewHttpError(code StatusCode, msg string) *HttpError {
+	return &HttpError{Status: code, Msg: msg}
+}