Cross-origin · Browser native computing · Free Local Tool

CORS Header Generator

Generates full CORS response headers based on source, method, headers, credentials and preflight cache.

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Complete guide to using the CORS header generator

Generates full CORS response headers based on source, method, headers, credentials and preflight cache. The tool does not require registration or package installation, and is suitable for completing work quickly on desktop and mobile browsers.

Recommended operating procedures

  1. First prepare data according to field descriptions and use sample values to confirm the expected format.
  2. After adjusting the options, perform processing and read the statistics and error messages in the result area.
  3. Check representative information before copying or downloading, and retain the original version for official use.

Applicable situations and practical suggestions

Common uses include front-end and back-end separation, API Gateway, and cross-domain debugging. Universal origins cannot be used when allowing credentials, and the actual response should also verify the Origin whitelist.

Privacy and Compliance

All input and calculations remain local to the browser and are not uploaded to the ToolHub servers. It is recommended to use the latest version of Chrome, Edge, Firefox or Safari; when it comes to target platform specifications, final verification still needs to be completed in the actual environment.

Frequently Asked Questions

What problem does a CORS header generator solve?
Generates full CORS response headers based on source, method, headers, credentials and preflight cache.
How to use CORS header generator?
First enter the data and adjust the options according to the field prompts, click "Process Now" to check the results and statistical information, and then use the copy or download function to carry it to the subsequent process.
What are the considerations for the results of the CORS header generator?
Universal origins cannot be used when allowing credentials, and the actual response should also verify the Origin whitelist.
Will the input data be uploaded to the server?
No. Tool computing is completed entirely in the current browser, and ToolHub does not receive, store or transmit your input.
In what situations is it appropriate to use the CORS header generator?
Common uses include front-end and back-end separation, API Gateway, and cross-domain debugging. Before formal application, it is recommended to use representative boundary data to verify again.

CORS Header Generator: inputs, output, and reproducible example

Use the free CORS Header Generator online. Fast, private, mobile-friendly, and processed directly in your browser.

What this page actually processes

FieldControlDefault exampleValidation role
Allowed SourceTexthttps://app.example.comAllowed Source is read by the browser as a text value before the tool runs.
Allow MethodTextGET, POST, PUT, DELETEAllow Method is read by the browser as a text value before the tool runs.
Allow HeadersTextContent-Type, AuthorizationAllow Headers is read by the browser as a text value before the tool runs.
Public HeadersTextX-Request-IdPublic Headers is read by the browser as a text value before the tool runs.
Pre-check CachesNumber86400Pre-check Caches is read by the browser as a number value before the tool runs.
Allow Cookie/CertificateToggleEnabledAllow Cookie/Certificate is read by the browser as a toggle value before the tool runs.
Add Vary: OriginToggleEnabledAdd Vary: Origin is read by the browser as a toggle value before the tool runs.

Reproduce the built-in example

Start with Allowed Source = https://app.example.com; Allow Method = GET, POST, PUT, DELETE; Allow Headers = Content-Type, Authorization; Public Headers = X-Request-Id; Pre-check Caches = 86400, then run CORS Header Generator. Change one input at a time so the effect on the result remains traceable.

After validating allowed source, allow method, allow headers, public headers, pre-check caches, the page displays its result in the output workspace and enables the relevant copy or download action.

When to use it and how to interpret the result

CORS Header Generator is intended for workflows involving Allowed Source, Allow Method, Allow Headers, Public Headers, Pre-check Caches.

Limits and checks before use

CORS Header Generator follows the validation rules documented on this page. Confirm units, source formats, and target-system requirements before production use.

Page verification record

Controls inspected7 documented inputsResult pathValidate → process → review → copy/downloadLast content review2026-09-02