---
title: "How do I handle authentication headers in cross-origin requests when integrating web services"  
description: "How do I handle authentication headers in cross-origin requests when integrating web services"  
author: "Asna Shehr"  
published: 2025-08-22  
updated: 2025-10-17  
canonical: https://answers.mindstick.com/qa/115478/how-do-i-handle-authentication-headers-in-cross-origin-requests-when-integrating-web-services  
category: "science and technology"  
tags: ["sharepoint"]  
reading_time: 1 minute  

---

# How do I handle authentication headers in cross-origin requests when integrating web services

## Answers

### Answer by Neologix Soltions

[Handling](https://www.mindstick.com/articles/61/exception-handling-in-c-sharp) [authentication](https://www.mindstick.com/articles/324836/how-to-use-authentication-in-asp-dot-net-core-mvc) headers in cross-origin requests (CORS) requires proper server configuration and [understanding](https://www.mindstick.com/news/2594/understanding-what-the-breakthrough-in-fusion-energy-really-means) of browser [security](https://www.mindstick.com/articles/1671/wcf-security-in-dot-net-technology-using-c-sharp) policies. When integrating [web services](https://www.mindstick.com/articles/942/basics-of-asp-dot-net-web-services), the server must explicitly allow cross-origin requests by setting the Access-[Control](https://www.mindstick.com/articles/137/asp-dot-net-ajax-control-toolkit-calendarextender)-Allow-Origin header to the requesting domain (or * for public APIs), and crucially, allow credentials by setting Access-Control-Allow-Credentials: true. To send authentication headers like tokens or cookies, the client (browser) must also set credentials: 'include' or credentials: 'same-origin' in the fetch or XMLHttpRequest call. Additionally, ensure the server includes Access-Control-Allow-Headers with necessary headers like [Authorization](https://www.mindstick.com/interview/1563/give-an-example-for-authorization-filters-in-an-asp-dot-net-mvc-application) to permit custom tokens. These [best practices](https://www.mindstick.com/articles/337208/best-practices-for-structuring-html-forms) are vital if you're building or integrating secure, cross-origin apps. This [web development](https://www.mindstick.com/services/web-development) service provides expert support for configuring secure APIs and handling CORS in complex [enterprise](https://www.mindstick.com/blog/246/enterprise-java-beans-ejb) applications.


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Original Source: https://answers.mindstick.com/qa/115478/how-do-i-handle-authentication-headers-in-cross-origin-requests-when-integrating-web-services

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