HTTP Tester
Test HTTP APIs and web services with advanced request configuration
Quick Start Templates
Request Configuration
Headers
Response
Send a request to see the response
Complete HTTP Request Tester Guide
HTTP Request Tester is a powerful online tool designed specifically for developers and testers. Supports sending various HTTP requests (GET, POST, PUT, DELETE, etc.), customizing request headers and body, viewing detailed response information. Whether testing RESTful APIs, debugging web services, verifying interface functionality, or learning HTTP protocol, you can easily accomplish it. The tool is completely free, requires no installation, and works in your browser. Understanding how to use the HTTP tester helps you improve development efficiency, quickly locate issues, and deeply understand HTTP communication mechanisms.
1如何使用 / How to Use
Step 1: Choose HTTP Method
Select HTTP request method from dropdown: GET (retrieve data), POST (create data), PUT (update data), DELETE (delete data), PATCH (partial update), HEAD (get response headers), OPTIONS (get supported methods). Different methods are used for different operation scenarios.
Step 2: Enter API URL
Enter the API URL to test in the URL input box. It can be any public API endpoint, like https://api.example.com/users. Make sure URL format is correct, including protocol (http:// or https://). You can use preset templates to get started quickly.
Step 3: Configure Headers (Optional)
Add custom request headers, such as Authorization (auth token), Content-Type (content type), User-Agent (user agent), etc. Click "Add" button to add new headers, can enable/disable each header. Common headers are preset.
Step 4: Add Request Body (POST/PUT/PATCH)
For POST, PUT, PATCH requests, you can enter data in the request body area. Supports JSON, XML, form data, and other formats. Make sure Content-Type header matches request body format. You can use preset templates to see examples.
Step 5: Send Request and View Response
Click "Send" button to send request. The right side will display detailed response information, including status code, response time, response size, response headers, and response body. You can copy or download response data, switch between raw/formatted view.
2实际应用场景 / Use Cases
1API Interface Testing
Test whether RESTful API interfaces work properly. Verify if GET requests can correctly retrieve data, POST requests can successfully create resources, PUT/PATCH can update data, DELETE can delete resources. Check response status codes, data formats, error handling, etc.
2Web Service Debugging
Debug web service issues and locate error causes. Test different combinations of request parameters, headers, and body, observe server responses. Analyze response time and size to optimize performance. Verify authentication mechanisms and permission controls work properly.
3Third-Party API Integration
Before integrating third-party APIs, test their functionality and response format first. Understand API request methods, required headers, parameter formats, etc. Verify if API keys and auth tokens are valid. Familiarize with API error codes and error messages.
4Learning HTTP Protocol
Learn how HTTP protocol works through hands-on practice. Understand purposes and differences of different HTTP methods, learn meanings of common request and response headers, master status code classifications (2xx success, 3xx redirect, 4xx client error, 5xx server error).
5API Documentation Verification
Verify accuracy of API documentation. Construct requests according to documentation, check if actual responses match documentation descriptions. Discover errors or omissions in documentation, provide timely feedback to development team. Ensure documentation is synchronized with actual implementation.
6Performance Testing
Test API response speed and performance. Observe response times of different requests, identify slow queries. Test response size and time of large data requests. Provide data support for performance optimization.
使用技巧与最佳实践 / Tips & Best Practices
Understanding HTTP Methods
GET: Retrieve resources, should have no side effects, cacheable. POST: Create resources, has side effects, not cacheable. PUT: Complete update of resource, idempotent operation. PATCH: Partial update of resource. DELETE: Delete resource, idempotent operation. HEAD: Only get response headers, no response body. OPTIONS: Query supported methods. Choosing correct method is important.
Common Request Headers Explained
Content-Type: Specify request body format (application/json, application/x-www-form-urlencoded, multipart/form-data, etc.). Authorization: Authentication info (Bearer token, Basic auth, etc.). Accept: Expected response format. User-Agent: Client identifier. Cache-Control: Cache control. Correctly setting headers ensures successful requests.
Status Code Meanings
200 OK: Success. 201 Created: Successfully created. 204 No Content: Success but no content. 301/302: Redirect. 400 Bad Request: Request error. 401 Unauthorized: Not authenticated. 403 Forbidden: No permission. 404 Not Found: Not found. 500 Internal Server Error: Server error. Understanding status codes helps quickly locate issues.
JSON Format Validation
When sending JSON request body, ensure format is correct. Use JSON validation tools to check syntax errors. Common errors: missing quotes, extra commas, mismatched brackets, etc. Content-Type must be set to application/json. You can use preset templates as reference.
CORS Issue Handling
Testing APIs in browser may encounter CORS (Cross-Origin Resource Sharing) issues. This tool uses proxy server to avoid CORS restrictions. If issues persist, check if target API allows cross-origin requests. Production environment requires server to correctly configure CORS response headers.
常见问题 / Frequently Asked Questions
技术说明 / Technical Details
This tool is built with modern web technologies, providing powerful HTTP request testing capabilities. **Core Features**: 1. Supports all standard HTTP methods (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS) 2. Custom request header management with enable/disable support 3. Flexible request body editor supporting multiple data formats 4. Detailed response information display (status code, response time, size, headers, body) 5. Response data copy and download functionality 6. Raw/formatted view toggle **Technical Implementation**: - Uses proxy server to avoid browser CORS restrictions - Precisely measures request response time (millisecond level) - Automatically calculates response data size - Automatic JSON data formatting and syntax highlighting - Supports scrollable viewing of large data responses **Privacy Protection**: Does not store any request or response data, all operations are completed between client and proxy server. Does not record API keys, auth tokens, or other sensitive information. **Tech Stack**: Next.js + React + TypeScript + Fetch API, ensuring high performance and stability.
🔒 隐私保护承诺 / Privacy Protection
所有处理都在您的浏览器本地完成，数据不会上传到任何服务器。您的隐私和数据安全是我们的首要任务。
All processing is done locally in your browser. No data is uploaded to any server. Your privacy and data security are our top priorities.