How to use Http Interceptor in Angular 17 

You're very welcome! I'm glad you found the tutorial helpful and to the point. If you enjoyed it, please consider giving it a like and subscribing to the channel for more straight-forward Angular tutorials. And for even more Angular tips, tricks, and in-depth guides, be sure to visit my blog at ayyaztech.com. Here are a couple other videos you might find useful: - Handling JWT token expiration: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nel5AvW44sc.html - Exception handling in Angular: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ypN-AdpuXnY.html Thanks again for watching and for your kind words!

The issue of continuous reloading without any console errors after implementing an interceptor could be due to an infinite loop in your interceptor logic. This often happens when the interceptor intercepts its own requests, causing a recursive call. To avoid this, you can add a condition to check if the request URL matches the one causing the loop and skip the interception for that specific URL. For example: ```typescript intercept(request: HttpRequest, next: HttpHandler): Observable { if (request.url === 'YOUR_PROBLEMATIC_URL') { return next.handle(request); } // Your interception logic here } ``` Replace `'YOUR_PROBLEMATIC_URL'` with the actual URL causing the issue. For more troubleshooting tips and in-depth Angular guides, check out my blog at ayyaztech.com. If this solves your problem, please like the video and subscribe for more Angular tutorials! Here are a couple other videos that might help: - Handling JWT token expiration: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nel5AvW44sc.html - Exception handling in Angular: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ypN-AdpuXnY.html Thanks for commenting and I hope this helps resolve your issue!

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I'm thrilled to hear that I could help you out! If you have any more questions or need further assistance in the future, don't hesitate to reach out. Remember to keep learning and growing in your job, and I'll be here to support you along the way. Thanks for your feedback, and best of luck with your endeavors! 😊🚀

I think because of functional interceptor. but if you use class based interceptor then it should work. Angular 17, like all previous releases, brings no breaking changes. However, it introduces major functionalities that use the latest browser features and make the framework more powerful, including changes to HTTP interceptors. One possible reason why previous interceptors from older versions did not work anymore on Angular 17 could be due to changes in the way interceptors are implemented or used in the new version. It's important to review the Angular 17 release notes and documentation to understand the specific changes that may have affected the behavior of interceptors. Additionally, considering that Angular 17 introduces new features and improvements, it's possible that the previous interceptors may need to be updated to align with the changes in the new version.

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@@AyyazTech already subscribed 😃

That's a fantastic suggestion! I'm pleased to inform you that your request has been heard, and a dedicated playlist for Angular 17 has just been created on the AyyazTech channel. This playlist is tailored to provide you with a comprehensive understanding of Angular 17, making it easier to navigate and learn at your own pace. You can find the Angular 17 playlist by visiting the playlists section on the AyyazTech channel. If you find this playlist helpful or have suggestions for additional topics, please let us know in the comments. Don’t forget to subscribe, like, and share this playlist with others who might find it useful. Your feedback helps us improve and expand our content offerings. Happy learning! 🌐📚👍

​@@AyyazTech Thank you so much Sir for Creating the Playlist. Please advise if we have any sequence or any Order in the playlist so that one can start in a sequence or in a flow. Like in the Udemy Course's we generally see.

You're very welcome! 🙌 Currently, the Angular 17 playlist contains individual how-to videos, and they are not organized in a specific sequence. However, your feedback is valuable, and I appreciate your suggestion. In the future, I do plan to launch proper courses with organized playlists, just like the Udemy courses you mentioned. This will make it easier for viewers to follow a structured learning path. Stay tuned for more updates, and happy learning! 🌐📚👍

I'm thrilled to hear you're interested in such insightful topics! Change detection, Zone.js, and performance optimization strategies are indeed crucial areas for developers, especially those working with frameworks like Angular. It sounds like you're eager to dive deeper into the nitty-gritty of efficient coding and application performance enhancement. I've added your request for videos on change detection, Zone.js, and performance optimization strategies to our potential content list. Your enthusiasm for learning more about these areas is exactly what inspires us to explore and share more in-depth knowledge. While you wait for these new videos, feel free to browse our existing content for other tips and tricks that might help you in the meantime. And if you haven't already, make sure to subscribe to the AyyazTech channel, like our videos, share with friends, and don't forget to click the bell icon so you won't miss out on our upcoming content based on your interests!

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Yes, you can definitely handle both token setup and error handling in a single interceptor instead of creating separate ones. Within the interceptor, you can check if the request requires a token and add it to the headers. Then, use the `catchError` operator from RxJS to handle any errors that occur during the request. For example: ```typescript return next.handle(authReq).pipe( catchError((error: HttpErrorResponse) => { if (error.status === 401) { // Handle 401 Unauthorized error } return throwError(error); }) ); ``` For more in-depth tutorials and articles on Angular, check out my blog at ayyaztech.com. And if you found this helpful, please like and subscribe for more Angular content! Here are a couple related videos: - Handling JWT token expiration: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nel5AvW44sc.html - Exception handling in Angular: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ypN-AdpuXnY.html Thanks for watching!

Hi there! It seems like you've followed the steps up to the 3:00-minute mark but encountered issues with intercepting API URLs, whereas image requests like '../assets/icons/icon-passkey.svg' are being caught by your interceptor. This discrepancy might arise from how the interceptor is set up or from specific configurations within your Angular project that affect API requests differently from asset requests. Here are a couple of suggestions to troubleshoot and possibly resolve the issue: Check Your Interceptor Configuration: Ensure your interceptor is correctly configured to handle all types of outgoing HTTP requests. This includes verifying the path matching for intercepting API calls. Angular's HTTP interceptors should, by design, intercept all outgoing HTTP requests if configured correctly. Review URL Patterns: Ensure that the interceptor's configuration does not unintentionally exclude API URLs. Sometimes, the way URLs are formatted or matched against patterns in the interceptor might lead to unintended exclusions. CORS and HTTP Protocol: Confirm that the issue isn't related to Cross-Origin Resource Sharing (CORS) policies or differences in how HTTP and HTTPS requests are handled, especially if your API URLs differ in protocol from your application's current environment. Dependencies and Angular Version: Double-check that all dependencies are up to date and compatible with Angular 17, as there might be changes or deprecations that affect how interceptors work. Since you've been closely following the tutorial on "How to use Http Interceptor in Angular 17," revisiting the steps or looking for additional configurations related to API requests in the context of interceptors could provide further insights. For a more detailed exploration and potential solutions, it might be beneficial to consult Angular's documentation on HTTP interceptors or seek guidance from Angular-focused communities. 📺 And while you're troubleshooting, you might find our other tutorials useful. Although not directly related, they can offer insights into Angular's broader capabilities and best practices. 🔔 Don't forget to subscribe to AyyazTech for more tips and updates. If you have any more questions or need further assistance, feel free to leave a comment below! Happy coding! 🚀

Thanks for reaching out with your question. It seems like you're encountering an issue where headers are only added to the first request when using HTTP Interceptors in Angular 17. This is often related to how the interceptor is implemented and how it handles subsequent requests. One possible cause could be the way the interceptor is managing the headers. If the headers are being set in a conditional manner, it might not be applying them to every request after the first one. Another possibility is that there's some state being maintained in the interceptor that isn't reset or updated properly for each request. Without seeing the specific code, it's a bit challenging to provide a precise solution. However, here are a couple of steps you can take: Review the Interceptor Logic: Ensure that the logic inside your interceptor is not conditionally applying headers based on some state that might not be updated correctly. State Management: Check if there’s any state in the interceptor that could be causing this behavior. Interceptors should ideally be stateless. Check Angular Lifecycle: Sometimes, issues can arise due to the way Angular manages the lifecycle of services and interceptors. Ensure your interceptor is properly integrated into your Angular module. Debugging: Use console logs inside your interceptor to debug and track how headers are being handled for each request. If you continue to face issues, consider sharing a snippet of your interceptor code for a more detailed insight. Also, stay tuned to AyyazTech for more content on advanced Angular topics, and don't forget to subscribe and click the bell icon for notifications on our latest videos! 🔍👨‍💻🔔

Thanks for your consideration. After many attempts, it worked after removing clientHydation from providers in appConfig And because i was injecting the hostname from window.location object So the condition won't work on the server.

I'm glad you liked the setup! In my Visual Studio Code, I mainly use the following extensions: GitHub Copilot: Offers AI-powered code suggestions and completions. Angular Essentials: A comprehensive extension pack for Angular development, including popular tools and extensions specific to Angular. Angular Language Service: Provides a rich editing experience for Angular templates, with completions, errors, hints, and navigation inside your Angular templates. These extensions significantly enhance productivity and efficiency, especially when working with Angular projects. If you have any more questions or need further recommendations, feel free to ask. And don't forget to subscribe to AyyazTech for more tech tips and tutorials. Hit the bell icon to stay updated on our latest content! 🔔👨‍💻🌟

To logout a user on a 401 status in the interceptor, you can inject your authentication service in the interceptor's constructor and call its logout method. Here's an example: ```typescript @Injectable() export class AuthInterceptor implements HttpInterceptor { constructor(private authService: AuthService) {} intercept(request: HttpRequest, next: HttpHandler): Observable { return next.handle(request).pipe( catchError((error: HttpErrorResponse) => { if (error.status === 401) { this.authService.logout(); } return throwError(error); }) ); } } ``` Make sure your authentication service is provided in the `providers` array of your module or standalone component. For more Angular authentication tutorials and articles, visit my blog at ayyaztech.com. And if this helped, please like and subscribe for more Angular tips! Here are some related videos: - Handling JWT token expiration: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nel5AvW44sc.html - Exception handling in Angular: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ypN-AdpuXnY.html Thanks for watching!

You're very welcome! If you ever need assistance again or have any questions, don't hesitate to ask. Have a great day! 😊

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Cancelling requests and modifying them for token authorization are common tasks when working with HTTP Interceptors in Angular. To address your query specifically: 1. Cancelling Requests: To cancel an HTTP request using an interceptor, you might use the RxJS `takeUntil` operator. You can create a service that holds a subject to trigger cancellation and inject it into your interceptor. Then, in the intercept method, use the `takeUntil` operator with the cancellation subject to cancel the request based on a specific condition. 2. Calling Other APIs for Token: To modify requests for token authorization, you would typically intercept the outgoing request and modify its headers to include the token. You can achieve this by injecting a service into your interceptor that handles token retrieval. This service might call your token API, retrieve the token, and then store it. When intercepting a request, use this service to append the `Authorization` header with the token value. For detailed implementation, refer to Angular's official documentation on interceptors and RxJS operators. The concept involves a combination of intercepting requests, modifying them, or cancelling them based on your application's specific needs. 🔔 Remember to subscribe to AyyazTech for more Angular tutorials and tips. If you have any specific scenarios or further questions, don't hesitate to ask in the comments below. Happy coding! 🚀

It sounds like you've followed the tutorial closely, but your HTTP interceptor isn't being triggered as expected. Here are a few common reasons why an interceptor might be ignored and some steps you can take to troubleshoot the issue: 1- Interceptor Not Provided in Module: Ensure your interceptor is properly provided in your Angular module. Since Angular 17 supports Standalone components, if you're working with a traditional module, your interceptor should be listed in the providers array of your NgModule. For a Standalone component setup, make sure you've correctly used the bootstrapApplication function and included your interceptor in the providers. 2- Incorrect Import: Double-check that the interceptor file is correctly imported into your module or component where you're specifying it as a provider. 3- Order of Interceptors: If you have multiple interceptors, the order in which they are provided matters. Interceptors are processed in the order they are provided. If another interceptor is returning the request or response before it reaches your interceptor, it might not get executed. 4- Interceptor Logic: Ensure that your interceptor is correctly implementing the intercept method and calling next.handle(request) within it. Failing to call next.handle will stop the request from proceeding. 5- Errors in Interceptor: Any errors thrown inside the interceptor can cause it to fail silently. Try wrapping your interceptor logic in a try-catch block to see if any errors are being thrown. 6-Path Mismatch: If your interceptor is meant to intercept requests to specific URLs, make sure the URLs you're trying to intercept match those specified in your interceptor. To debug, you can place console.log statements inside your interceptor to ensure it's being hit and to inspect the request it's intercepting. If you're still unable to resolve the issue, I recommend creating a minimal reproducible example and seeking help on platforms like Stack Overflow or Angular's GitHub issues page. Remember to subscribe to our channel for more Angular tutorials and tips! If you have any specific topics you'd like us to cover, please let us know in the comments below.

@@AyyazTechthank you for the concise response, turned that my interceptor was being overridden by another class and it started working as soon as I removed it. I've also implemented your interceptor for 40* errors which worked great, thank you!

It's great to hear that you're looking to update your HTTP Interceptor class from Angular 16 to Angular 17. While this video specifically covers the Angular 17 approach, your existing interceptor from Angular 16 might still be compatible or require minimal changes. Generally, Angular tries to maintain backward compatibility or offers clear migration paths. However, understanding the exact changes and how they might affect your current setup is crucial. I've noted your request and will consider creating a detailed comparison and guide on transitioning HTTP interceptors from Angular 16 to 17 in a future video. This should provide you with the specific insights needed to update your project efficiently. In the meantime, you might want to review the Angular update guide and check for any breaking changes or deprecations that could affect your interceptor. And of course, if you encounter any specific issues or have questions, feel free to reach out. Don't forget to like, subscribe, and hit the bell icon to stay updated with AyyazTech for more helpful content and future videos on this topic! Your engagement helps us understand what content is most valuable to you.

To use Snackbar within an HTTP interceptor in Angular, you would typically inject the MatSnackBar service from Angular Material into your interceptor. However, directly injecting UI services like MatSnackBar into interceptors is not a common practice due to potential circular dependency issues. Instead, consider using an error handling service that can be called from the interceptor to display the Snackbar. This service can then inject MatSnackBar to show messages. For example: typescript: @Injectable({ providedIn: 'root' }) export class ErrorHandlerService { constructor(private snackBar: MatSnackBar) {} showError(message: string) { this.snackBar.open(message, 'Close', { duration: 3000 }); } } And in your interceptor: typescript: @Injectable() export class YourInterceptor implements HttpInterceptor { constructor(private errorHandlerService: ErrorHandlerService) {} intercept(req: HttpRequest, next: HttpHandler): Observable { return next.handle(req).pipe( catchError((error: HttpErrorResponse) => { // Use the error handling service to show the snackbar this.errorHandlerService.showError('An error occurred'); return throwError(error); }) ); } } Make sure to register your interceptor and error handling service properly in your Angular module.

But if I use standalone logic , not modular approach. How I can use any service in interceptor ?

@@user-pi9px2qz3m It's possible, here what I have. /** * Intercepts HTTP requests to handle errors globally. * Utilizes SnackbarService to display error messages. */ export const errorHandlerInterceptor: HttpInterceptorFn = (req, next) => { // Inject the SnackbarService at runtime to display error messages const snackbarService = inject(SnackbarService); return next(req).pipe( catchError((error) => { console.error('An error occurred:', error.message); console.error('Error message:', error.error); // Extract a more user-friendly error message const errorMessage = error?.message || 'An unexpected error occurred. Please try again later.'; // Use the SnackbarService to show the error message snackbarService.showError(errorMessage); // Return nothing, we don't propagate the error. return []; }) ); }; and you have to configure correctly your main.ts with provideHttpClient(withInterceptors([errorHandlerInterceptor])

With the deprecation of retryWhen in newer versions of RxJS, you can use the retry operator directly for simple retry mechanisms, or combine catchError with retry for more complex logic, like retrying on specific errors. Here’s a way to retry a failed request up to 3 times if it's a 500 error: intercept(req: HttpRequest, next: HttpHandler): Observable { return next.handle(req).pipe( catchError(error => { if ([500].includes(error.status)) { // Use RxJS 'retry' for retrying return next.handle(req).pipe(retry(3)); } // For other status codes, or after retries, re-throw the error return throwError(error); }) ); } This approach uses catchError to catch the error, checks the status, and then attempts to retry the request if the condition matches.

@@AyyazTech thank you!

If your HTTP Interceptor isn't working as expected with AWS Cognito or in general, there could be several reasons. Here are some common issues to check and ideas to consider: Interceptor Registration: Ensure that your interceptor is properly registered in the module where you're using your HTTP client. The interceptor must be provided in the providers array of your Angular module like this: providers: [ { provide: HTTP_INTERCEPTORS, useClass: YourInterceptorClass, multi: true } ] Order of Interceptors: If you have multiple interceptors, the order in which they are provided can affect their execution. Make sure the order is as intended. Errors in the Interceptor: Ensure there are no errors in your interceptor code. Even a simple mistake can prevent it from functioning. Try adding console logs or debugging to confirm it's being hit. Path Matching: Your interceptor might be set to listen to specific paths. Ensure the URLs you're requesting match the interceptor's criteria. CORS Issues: When making requests to AWS Cognito or any other external service, ensure CORS (Cross-Origin Resource Sharing) is correctly configured. Sometimes, the browser might block the request before it even leaves your application due to CORS policies. HTTP vs. HTTPS: If your application is served over HTTPS, all requests must also be over HTTPS. Ensure there's no mismatch in protocols. Importing HttpClientModule: Confirm that you've imported HttpClientModule from @angular/common/http in your app module. AWS Cognito Specific: Ensure that the request to AWS Cognito is correctly formatted and that the necessary authentication tokens or parameters are included. AWS Cognito might reject improperly formatted requests before your interceptor can log anything. Check Network Tab: Use the browser's developer tools to check the network tab for the request. It might provide clues about what's going wrong. Backend Logs: If possible, check the logs on the AWS Cognito side to see if the request is reaching the service and what responses are being given. If you've gone through these checks and still face issues, consider creating a simplified version of the interceptor to test basic functionality, like logging all outgoing requests. This can help isolate whether the problem is with the interceptor itself or the specific way it's being used with AWS Cognito. Remember, debugging can sometimes be a process of elimination. Keep iterating through potential issues, and you'll likely pinpoint the problem. If you have further details or specific error messages, feel free to share them for more targeted advice. And don't forget to subscribe and hit the bell icon on AyyazTech for more troubleshooting tips and tech solutions!

@@AyyazTech Thanks for your response. Turns out that it WAS working. However, the sender of the http requests was the aws-amplfy library and they do not use the Angular HttpClient but some other third party library. As soon as I added my own http request using HttpClient (as you do) it worked. Never thought about the fact aws-amplify might be using something entirely different. This is good, because after the authentication has been established via Cognito, then I have a whole bunch of code making calls into my own APIs using HttpClient. This is where I need the interceptor. As I am moving from Angular 16 to 17 I had not ported over that code yet. Now I have and it works. My stupidity. Cost me a full day!

Hey there! I understand the frustration when interceptors don't work as expected. I'll prepare a video specifically addressing interceptors in Angular 16, which should still be quite relevant for Angular 17. Keep an eye out for it, and in the meantime, make sure to subscribe and hit the bell icon so you won't miss the video. Your feedback is crucial, so feel free to share any specific issues you're facing. Thanks for reaching out!

We're so glad you found the tutorial on using HTTP Interceptors in Angular 17 helpful! 😊 Your appreciation truly means a lot to us. To further enhance your Angular skills, here are some more tutorials from our channel that you might find valuable: - "How to handle JWT token expiration in Angular 17?" (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nel5AvW44sc.html) to ensure a seamless user experience by properly managing token expiration. - "How to fetch data from an API and display it in Angular 17?" (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-G22R_TzQaJ4.html) for mastering the art of retrieving data and integrating APIs into your Angular applications. Remember to like, share, and subscribe to stay updated with our latest content. And if there's anything specific you'd like us to cover, feel free to drop a comment below. Happy coding! 🚀

To implement class-based HTTP interceptors in Angular 17, follow these steps: 1. Create a Class Implementing `HttpInterceptor` Interface: Define a new class that implements the `HttpInterceptor` interface. This class should include the `intercept` method which takes `HttpRequest` and `HttpHandler` as parameters. Inside this method, you can perform your desired operations on the HttpRequest, then pass it to the next handler. Example: ```typescript @Injectable() export class AppHttpInterceptor implements HttpInterceptor { intercept(req: HttpRequest, next: HttpHandler): Observable { // Do whatever you want with the HttpRequest return next.handle(req); // Invoke the next handler } } ``` 2. Provide the Interceptor in the Root Module: Once the interceptor class is defined, provide it in your root module (`AppModule`). Use the `HTTP_INTERCEPTORS` token to register your interceptor. This registration informs Angular to use your interceptor for HTTP requests across the application【66†source】. Example: ```typescript @NgModule({ providers: [ { provide: HTTP_INTERCEPTORS, useClass: AppHttpInterceptor, multi: true } ], // Other module properties }) export class AppModule { } ``` The `multi: true` option in the provider configuration is crucial as it allows multiple interceptors to be combined. If you have several interceptors, Angular will execute them in the order they are provided. For Angular 17, while the CLI generates functional interceptors by default, class-based interceptors are still available and can be used with the `--no-functional` option if you're generating interceptors via the CLI. However, you are encouraged to use functional ones. If you have further questions or need more assistance, feel free to ask. Don't forget to subscribe to AyyazTech for more Angular tutorials and updates! 🔔👨‍💻🌐

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Hey there! I understand the frustration when interceptors don't work as expected. I'll prepare a video specifically addressing interceptors in Angular 16, which should still be quite relevant for Angular 17. Keep an eye out for it, and in the meantime, make sure to subscribe and hit the bell icon so you won't miss the video. Your feedback is crucial, so feel free to share any specific issues you're facing. Thanks for reaching out!

Thanks for watching the tutorial and for your question! In Angular 17, the process for implementing interceptors has evolved. The Angular CLI now generates functional interceptors by default. If you're not using standalone components, you might need to adapt to this new pattern. While the traditional method of adding interceptors in the app.module.ts file may not directly apply, the new functional interceptors should offer a more streamlined integration. If you are using app.module.ts then you may try using app.module.ts instead. I recommend exploring the Angular documentation or community forums for specific implementation examples in Angular 17. If you have any more questions, feel free to ask! Remember to subscribe to AyyazTech for more Angular insights and updates. Your engagement helps us create content that's relevant and helpful to our community! 🔔💡👨‍💻

@@AyyazTech Thank you ♥️👍

Creating a unit test for an HTTP interceptor involves mocking the HttpHandler and HttpRequest objects and verifying that your interceptor behaves as expected. If there's a specific video you're referring to, please ensure it covers these aspects: Mocking HttpHandler to simulate sending requests. Mocking HttpRequest to test how your interceptor modifies requests. Using Jasmine or another testing framework to assert that your interceptor logic (like adding headers, handling errors, or logging) is correctly applied. To create a comprehensive unit test, you would typically use Angular's HttpClientTestingModule and TestBed to set up an environment where you can inject your interceptor along with mock services to test its behavior in isolation. If you're looking for more detailed guidance on creating unit tests for HTTP interceptors, I recommend checking out the Angular official documentation or looking for tutorials that specifically address testing interceptors in Angular.

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