X-dev-access Yes Upd

GET /api/users/debug/123 → 404 Not Found

: Right-click the login request and select "Edit and Resend" (or use a tool like Burp Suite ).

Setting access to "yes" or * (wildcard) is generally safe for development environments but should be restricted in production to specific domains for security reasons. x-dev-access yes

Because headers can be easily spoofed by anyone using tools like Postman, cURL, or browser developer tools,

On the backend, an application might be programmed to look for this header. If present, the server might return more detailed error messages, stack traces, or execution timings that would normally be hidden from a regular user for security reasons. 3. Feature Flagging GET /api/users/debug/123 → 404 Not Found : Right-click

x-dev-access-enabled: true x-dev-warning: This response contains internal data

Use it alongside a secure Bearer token or API key. If present, the server might return more detailed

In the world of web development, API integration, and debugging, you will often encounter custom HTTP headers. One that frequently pops up in specialized environments or during the use of specific developer tools is x-dev-access: yes .

If you are using a framework like Node.js (Express), checking for this header is straightforward: javascript

The "X-" prefix traditionally stands for or Extension . In the early days of HTTP, any header that wasn't part of the official standard was required to start with X- .

x-dev-access: yes