Security

CORS Header Generator

Build Access-Control-Allow-Origin, Methods, Headers, optional credentials, Max-Age, and Expose-Headers snippets for Apache (mod_headers) or Nginx (add_header). Generation runs entirely in your browser — nothing uploaded to DroidXP, same local model as APK Analyzer and APK String Extractor.

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Exact origin (recommended) or * for anonymous requests — not with credentials.

Access-Control-Allow-Methods

Validate with browser DevTools Network or curl -i -H "Origin: …". You may still need explicit OPTIONS handling in your app or edge layer. Pair with TLS review via our SSL Certificate Checker and Apache patterns from the .htaccess Generator.

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What is CORS?

Cross-Origin Resource Sharing (CORS) tells browsers which other origins may read responses from your API when a web page uses fetch, XMLHttpRequest, or similar. It is enforced in the browser via response headers — not a substitute for authentication on the server.

What this generator produces

Static snippets for Apache (Header set inside <IfModule mod_headers.c>) and Nginx (add_header … always;). One Allow-Origin value per block; dynamic multi-origin allowlists usually belong in application or API gateway code.

Privacy

All fields and output stay in your browser; preferences are saved with localStorage for this site. DroidXP does not receive your origins or config text — consistent with how we handle APKs in APK Analyzer and APK String Extractor.

How to use this tool

  1. Step 1: Set Allow-Origin to your front-end URL (or * only without credentials).
  2. Step 2: Choose methods, header list, optional Max-Age and Expose-Headers, then pick Apache, Nginx, or both.
  3. Step 3: Copy into the correct server scope, reload config, and verify with a real cross-origin request and preflight (OPTIONS).

Frequently Asked Questions

Does DroidXP see my API origin or generated headers?

No. Options and output are assembled in your browser. Nothing is sent to DroidXP servers for this tool.

Why can’t I use * with Access-Control-Allow-Credentials?

Browsers forbid combining wildcard origin with credentials (cookies, authorization headers). Use a specific https:// origin or drop credentials.

Is this enough for a full CORS setup?

It covers common response headers. You may still need to handle OPTIONS preflight (204/200), duplicate header issues, or dynamic origins in application code — especially for multiple allowed origins.

Apache vs Nginx — which block do I paste?

Apache snippets use mod_headers — often .htaccess or a VirtualHost. Nginx uses add_header inside server or location; duplicate add_header inheritance can surprise you — test carefully.

Do I need mod_headers on Apache?

Yes for Header set directives. If the module is missing you will get errors or silent ignores depending on host — check httpd -M or your provider’s docs.

Why does Nginx show duplicate CORS headers?

add_header in nested levels can replace or merge differently by version. Prefer one clear location block for API routes and avoid stacking conflicting add_header chains.

What about preflight OPTIONS requests?

Browsers send OPTIONS before some cross-origin requests. Your app or edge layer must respond appropriately — headers alone may not route OPTIONS to your handler; verify with curl -X OPTIONS -i.

Can I allow multiple web app origins?

This generator outputs one Allow-Origin value. Multiple origins usually need server logic to echo Access-Control-Allow-Origin from an allowlist — implement in your API or gateway, not copy-paste alone.

Is Access-Control-Allow-Origin enough for security?

CORS is a browser enforcement mechanism, not a full auth layer. Always validate requests server-side; never rely on CORS alone to protect private APIs.

How is this related to the .htaccess Generator?

The .htaccess Generator focuses on site-wide Apache patterns (HTTPS, caching, SPA). This tool targets CORS response headers — often for APIs; they complement each other.

Can I use this output in production?

Treat it as a starting point. Test with your real front-end origin, credentials, and error responses; use staging and monitoring before production cutover.

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