Merge pull request mendix#9780 from pommi/mendix-cloud-request-headers-case-insensitive-header-names

mendix-cloud-request-headers: case-insensitive header names

Author: OlufunkeMoronfolu

content/en/docs/deployment/mendix-cloud-deploy/mendix-cloud-request-headers.md

@@ -18,6 +18,18 @@ Most of the request headers are added by the HTTP client (the web browser, for e
 
 Using custom Java code in the application, the full content of an incoming request can be inspected.
 
+Request header names are case-insensitive, as defined by [RFC 2616](https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2). This means that headers such as `X-Header-Key`, `x-header-key`, and `X-HEADER-KEY` must be processed in the same way. 
+
+When processing request headers, Mendix recommends converting all request headers names to lowercase to account for case-insensitivity. For example:
+
+```bash
+toLowerCase($HeaderKey) = 'x-header-key'
+```
+
+This ensures consistent handling regardless of the casing used in incoming requests and supports compliance with HTTP standards.
+
+{{< figure src="/attachments/deployment/mendix-cloud-deploy/mendix-cloud-request-headers/tolowercase-header-name.png" alt="Lowercase Request Header Names" width=50%  >}}
+
 ### Usually Available Request Headers Set by the HTTP Client
 
 The following headers are usually set by the HTTP client. Mendix Cloud does not touch the value of these headers. This also means that they might not be available if the HTTP client does not set them.