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 (Header set) inside IfModule—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.

Apache / Nginx CORS snippets — one origin, not an allowlist engine

When to use this — and when not to

Use it to paste a starting Apache or Nginx block for one front-end origin talking to one API. Then still send a real OPTIONS from the browser (or curl -X OPTIONS -i) and watch the response.

Do not use * with credentials — we refuse that combination because browsers do. Do not expect a multi-origin allowlist. Echoing Origin from a server allowlist is application code, not this snippet. CORS is not authentication.

What the generator actually emits

Apache: Header set inside <IfModule mod_headers.c>. Nginx: add_header … always;. One Allow-Origin, methods, headers, optional Max-Age, credentials, Expose-Headers. Preferences sit in localStorage on this origin.

Worked example

Front-end https://app.example.com, API on Apache, GET+POST+OPTIONS, credentials off:

Header set Access-Control-Allow-Origin "https://app.example.com"
Header set Access-Control-Allow-Methods "GET, POST, OPTIONS"
Header set Access-Control-Allow-Headers "Content-Type, Authorization"

If preflight still fails, your edge is not answering OPTIONS or Nginx nested add_header dropped the set. Fix routing, not this form. Related: HTTP request builder for the client side of the same call.

Mistakes people make

Stacking add_header in server and location until duplicates or missing headers appear.
Allowing * and cookies. Browsers refuse it; we do too.
Treating CORS as a lock on the API. curl still works.

.htaccess generator · HTTP request builder

Frequently asked questions

Does this send OPTIONS?

No. Text only. You still test the live origin.

Multiple front-end origins?

Not here. Implement an allowlist in the API or gateway.

Need mod_headers?

Yes for Apache Header set. Missing module → ignore or 500 depending on host.

Is this enough for production?

It is a starting snippet. Test error responses too — some stacks omit CORS on 4xx/5xx.

Static Access-Control-* text. Not a CORS audit.

When to use this — and when not to

What the generator actually emits

Worked example

Mistakes people make

Related

Frequently asked questions

Does this send OPTIONS?

Multiple front-end origins?

Need mod_headers?

Is this enough for production?

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