feat(data): add ability to configure trailing slashes

modules/data/spec/dataservices/default-data.service.spec.ts

@@ -543,5 +543,27 @@ describe('DefaultDataServiceFactory', () => {
       heroDS.getAll();
       expect(http.get).toHaveBeenCalledWith(newHeroesUrl, undefined);
     });
+
+    it('should keep trailing slash', () => {
+      const newHeroesUrl = 'some/other/api/heroes/';
+      const config: DefaultDataServiceConfig = {
+        root: '//example.com/api/',
+        entityHttpResourceUrls: {
+          Hero: {
+            entityResourceUrl: '/api/hero/',
+            collectionResourceUrl: newHeroesUrl,
+          },
+        },
+        trailingSlashEndpoints: true,
+      };
+      const factory = new DefaultDataServiceFactory(
+        http,
+        httpUrlGenerator,
+        config
+      );
+      const heroDS = factory.create<Hero>('Hero');
+      heroDS.getAll();
+      expect(http.get).toHaveBeenCalledWith(newHeroesUrl, undefined);
+    });
   });
 });

modules/data/src/dataservices/default-data-service-config.ts

@@ -23,4 +23,6 @@ export abstract class DefaultDataServiceConfig {
   saveDelay?: number;
   /** request timeout in MS (default: 0)*/
   timeout?: number; //
+  /** to keep trailing slashes or not; false by default */
+  trailingSlashEndpoints?: boolean;
 }

modules/data/src/dataservices/default-data.service.ts

@@ -34,6 +34,7 @@ export class DefaultDataService<T> implements EntityCollectionDataService<T> {
   protected getDelay = 0;
   protected saveDelay = 0;
   protected timeout = 0;
+  protected trailingSlashEndpoints = false;
 
   get name() {
     return this._name;
@@ -53,9 +54,11 @@ export class DefaultDataService<T> implements EntityCollectionDataService<T> {
       getDelay = 0,
       saveDelay = 0,
       timeout: to = 0,
+      trailingSlashEndpoints = false,
     } = config || {};
     this.delete404OK = delete404OK;
-    this.entityUrl = httpUrlGenerator.entityResource(entityName, root);
+    this.entityUrl = httpUrlGenerator.entityResource(entityName, root,
+      trailingSlashEndpoints);
     this.entitiesUrl = httpUrlGenerator.collectionResource(entityName, root);
     this.getDelay = getDelay;
     this.saveDelay = saveDelay;

modules/data/src/dataservices/http-url-generator.ts

@@ -41,7 +41,8 @@ export abstract class HttpUrlGenerator {
    * Return the base URL for a single entity resource,
    * e.g., the base URL to get a single hero by its id
    */
-  abstract entityResource(entityName: string, root: string): string;
+  abstract entityResource(entityName: string, root: string,
+    trailingSlashEndpoints: boolean): string;
 
   /**
    * Return the base URL for a collection resource,
@@ -77,11 +78,12 @@ export class DefaultHttpUrlGenerator implements HttpUrlGenerator {
    */
   protected getResourceUrls(
     entityName: string,
-    root: string
+    root: string,
+    trailingSlashEndpoints: boolean = false
   ): HttpResourceUrls {
     let resourceUrls = this.knownHttpResourceUrls[entityName];
     if (!resourceUrls) {
-      const nRoot = normalizeRoot(root);
+      const nRoot =  trailingSlashEndpoints ? root:  normalizeRoot(root);
       resourceUrls = {
         entityResourceUrl: `${nRoot}/${entityName}/`.toLowerCase(),
         collectionResourceUrl: `${nRoot}/${this.pluralizer.pluralize(
@@ -99,8 +101,9 @@ export class DefaultHttpUrlGenerator implements HttpUrlGenerator {
    * @param root {string} Root path to the resource, e.g., 'some-api`
    * @returns complete path to resource, e.g, 'some-api/hero'
    */
-  entityResource(entityName: string, root: string): string {
-    return this.getResourceUrls(entityName, root).entityResourceUrl;
+  entityResource(entityName: string, root: string,
+    trailingSlashEndpoints: boolean): string {
+    return this.getResourceUrls(entityName, root, trailingSlashEndpoints).entityResourceUrl;
   }
 
   /**