feat(errors): add dedicated error type for blocked content

error.go

@@ -22,6 +22,7 @@ const (
 	// ErrForbidden is returned when the client doesn't have permission to
 	// perform the requested operation.
 	ErrForbidden
+	ErrBlocked
 )
 
 func (e ErrorType) Error() string {
@@ -40,6 +41,8 @@ func (e ErrorType) String() string {
 		return "rate limited"
 	case ErrForbidden:
 		return "request forbidden"
+	case ErrBlocked:
+		return "content blocked"
 	default:
 		return "unknown error code"
 	}

http/parse.go

@@ -235,6 +235,8 @@ func parseResponse(httpRes *http.Response, req *cmds.Request) (cmds.Response, er
 				e.Code = cmds.ErrRateLimited
 			case http.StatusForbidden:
 				e.Code = cmds.ErrForbidden
+			case http.StatusGone, http.StatusUnavailableForLegalReasons:
+				e.Code = cmds.ErrBlocked
 			default:
 				e.Code = cmds.ErrNormal
 			}

http/responseemitter.go

@@ -238,8 +238,11 @@ func (re *responseEmitter) sendErr(err *cmds.Error) {
 
 	// Set the status from the error code.
 	status := http.StatusInternalServerError
-	if err.Code == cmds.ErrClient {
+	switch err.Code {
+	case cmds.ErrClient:
 		status = http.StatusBadRequest
+	case cmds.ErrBlocked:
+		status = http.StatusUnavailableForLegalReasons
 	}
 	re.w.WriteHeader(status)