add 'Configuration.PathIntelligence' and 'OnErrorCode' and 'OnAnyErrorCode' on APIContainer

Former-commit-id: bc3d0232106622063205f326bfa4ed3aa84179de

core/router/api_container.go

@@ -229,3 +229,19 @@ func (api *APIContainer) Any(relativePath string, handlersFn ...interface{}) (ro
 
 	return
 }
+
+// OnErrorCode registers a handlers chain for this `Party` for a specific HTTP status code.
+// Read more at: http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
+// Look `OnAnyErrorCode` too.
+func (api *APIContainer) OnErrorCode(statusCode int, handlersFn ...interface{}) []*Route {
+	handlers := api.convertHandlerFuncs("/{tail:path}", handlersFn...)
+	return api.Self.OnErrorCode(statusCode, handlers...)
+}
+
+// OnAnyErrorCode registers a handlers chain for all error codes
+// (4xxx and 5xxx, change the `ClientErrorCodes` and `ServerErrorCodes` variables to modify those)
+// Look `OnErrorCode` too.
+func (api *APIContainer) OnAnyErrorCode(handlersFn ...interface{}) []*Route {
+	handlers := api.convertHandlerFuncs("/{tail:path}", handlersFn...)
+	return api.Self.OnAnyErrorCode(handlers...)
+}

core/router/handler.go

@@ -417,6 +417,16 @@ func (h *routerHandler) HandleRequest(ctx context.Context) {
 		}
 	}
 
+	if config.GetEnablePathIntelligence() && method == http.MethodGet {
+		closestPaths := ctx.FindClosest(1)
+		if len(closestPaths) > 0 {
+			u := ctx.Request().URL
+			u.Path = closestPaths[0]
+			ctx.Redirect(u.String(), http.StatusMovedPermanently)
+			return
+		}
+	}
+
 	ctx.StatusCode(http.StatusNotFound)
 }