Same-Origin Policy Tester

Free
Utility

Test cross-origin requests and evaluate Same-Origin Policy restrictions.

(4.6) reviews
No signup required

Same-Origin Policy Tester

https://example.com
https://api.example.com
Request Status:
Blocked
Recommendations
  • Consider using CORS headers to allow cross-origin requests
  • You may need to implement a CORS preflight request handler

Example Scenarios

Common

Basic AJAX Request
Common XMLHttpRequest to same domain with different subdomain
XHR
AJAX
Subdomain
API
CDN Resource Loading
Loading a script from a common CDN provider
SCRIPT
CDN
Script Loading
Third-party
Iframe Embedding
Embedding content from different origin in an iframe
IFRAME
iframe
Embedding
Third-party
Microservices Communication
Frontend accessing multiple backend services
XHR
Microservices
API
Architecture

Security

Cross-Protocol Access
HTTP to HTTPS upgrade scenario
XHR
Mixed Content
Security
HTTPS
Form Submission
Cross-origin form POST to payment processor
FORM
Form
Payment
POST

Edge Cases

Non-standard Port
Development server on custom port accessing production API
XHR
Development
Local
API
WebSocket Connection
Establishing WebSocket connection to real-time service
XHR
WebSocket
Real-time
Protocol

Analyze Cross-Origin Request Behavior

Professional Features

Simulate cross-origin requests and understand how browsers enforce the Same-Origin Policy.

Simulate Cross-Origin Requests

Test requests between different origins to analyze Same-Origin Policy enforcement.

Feature
Active

Supports Various Request Types

Test XHR, fetch, images, scripts, styles, iframes, and forms for cross-origin behavior.

Feature
Active

Get Security Recommendations

Receive warnings and best practices to resolve blocked cross-origin requests.

Feature
Active
3+
Features
99.9%
Reliability
24/7
Available
Free
Always

How to Use the Same-Origin Policy Tester

Simple 4-step process

Follow these easy steps to get started with Same-Origin Policy Tester and achieve your goals quickly.

1
Step 1

Enter the source and target origins, including scheme, host, and port.

Easy
2
Step 2

Select the request type (XHR, image, script, iframe, etc.) and access type.

Easy
3
Step 3

Run the test to check whether the request is allowed or blocked.

Easy
4
Step 4

Review warnings and recommendations for resolving policy restrictions.

Easy
Ready to start?
Tool is ready to use
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Easy Process
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Instant Results
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Frequently Asked Questions

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