Скачать или смотреть How to Get the Referring Website in a Blazor Server App

Learn how to capture the `referring URL` in your Blazor Server App to enhance your contact forms and user navigation experience.
---
This video is based on the question https://stackoverflow.com/q/62578910/ asked by the user 'Connie DeCinko' ( https://stackoverflow.com/u/10344592/ ) and on the answer https://stackoverflow.com/a/62580086/ provided by the user 'Vi100' ( https://stackoverflow.com/u/1756978/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: How to get referring website in Blazor Server App

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Get the Referring Website in a Blazor Server App

Creating a user-friendly and efficient web application often involves recognizing where your users come from. In this guide, we will explore how to capture the referring website in a Blazor Server App, particularly when directing users to a centralized contact form. Understanding where users are redirected from can significantly enhance user experience by allowing the app to personalize responses or redirect users back to their original sites.

The Challenge

When building your Blazor Server App, especially for a multi-website platform that utilizes a common contact form, it's essential to determine the referring URL. This information can be used for:

Sending email notifications with the original site information.

Creating “return to website” buttons for a seamless user experience.

But the question arises: Where and how should you capture the referring URL?

Understanding HttpContext in Blazor Server Apps

It's a common misconception that HttpContext is inaccessible in Blazor Server Apps. However, while the app behaves similar to a single-page application, you can still access HttpContext during the initial request to your application. This is typically when a user accesses the _Host.cshtml file.

Key Points:

Single Page Application: After the initial load, the URLs observed in the browser are not actual URLs but represent the app's state.

Capture HttpContext: You can only 'catch' the HttpContext during the initial call when the app is served.

Step-by-step Solution

To effectively capture the referring website, you can follow these steps:

Step 1: Open the _Host.cshtml File

In the _Host.cshtml file, you have access to the HttpContext object since this is a "real" page of your app. If you don't have access, make sure to include the necessary namespace at the top:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Capture the Referring URL

You can fetch the Referer header from the request and pass it as a parameter to your Blazor application:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Create a Parameter in App.razor

In your main App.razor, you need to define a parameter to accept this referring URL:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Use the Referer Value

Once you have the Referer parameter set up, you can either store this information in a service, pass it through other components, or use it as needed in your app.

Store it in a service for retrieval later.

Use it as a cascading parameter for child components.

Implement it to create dynamic buttons for navigation.

Conclusion

Capturing the referring website in your Blazor Server App doesn't have to be complex. By utilizing the HttpContext on the initial request, you can pass the Referer URL throughout your application for improved functionality. This simple approach provides a foundation for a more personalized user experience.

If you face challenges implementing this, don't hesitate to reach out or explore more resources. Happy coding!