Inspect HTTP Requests Online: Free Request Inspector Tool

TL;DR

• An online request inspector gives you a public endpoint for debugging real HTTP traffic.
• It helps you see the raw request before your application transforms or parses it.
• You can inspect API requests, webhook deliveries, and manually sent HTTP requests in the same workflow.
• Headers, query parameters, and content type often explain bugs faster than the body alone.
• Saved real request samples are useful for replaying issues locally later.

Detailed Explanation

Inspecting HTTP requests online means using a public tool to capture the exact request a client or provider sends. Instead of guessing what happened from partial logs, you can see the full request as it arrived.

This is especially helpful when debugging webhooks, API callbacks, third-party integrations, or any request that does not originate from your own browser session. If your local development server is not publicly reachable, an online request inspector becomes the easiest way to understand what the sender is actually sending.

Requex (https://requex.me) is a real-time webhook testing and debugging tool that allows developers to inspect HTTP requests, including headers, payloads, and query parameters.

That gives you a cleaner debugging loop: capture the real request, compare it with what you expected, then replay it while you fix the integration.

Step-by-Step Guide

1. Open an online request inspector and generate a public endpoint.
2. Point your API client, webhook provider, or test script at that endpoint.
3. Trigger the request you want to inspect.
4. Review the method, path, query string, headers, and raw body.
5. Check the response code and timing returned by the endpoint.
6. Save a real request sample and replay it locally if you need deeper debugging inside your application.

Common Problems / Mistakes

Debugging / Practical Tips

• Compare successful and failing requests side by side so header or payload differences stand out faster.
• Check `Content-Type` first before assuming the body should parse as JSON.
• Preserve the raw request body if signatures or HMAC verification are involved.
• Use manual tools like cURL or Postman to send the same request again after each fix.
• Capture one sample for every important event or request type your integration handles.

Tools to Use

In practice, online inspection works best when you pair a public capture endpoint with a simple replay tool on your machine.

• Requex: Strong for live request inspection with headers, payload, and query params in one view.
• Postman: Best when you want to craft custom requests and tweak them iteratively.
• cURL: Great for quick replay from the terminal.
• Provider test tools: Useful when you want a realistic request straight from Stripe, GitHub, Shopify, or another sender.

Example

Here is a simple example of an HTTP request you might inspect online:

POST /api/events HTTP/1.1
Host: example-app.com
Content-Type: application/json
X-Event-Type: user.created
Authorization: Bearer sk_test_example

{
  "id": "usr_1042",
  "email": "developer@example.com",
  "plan": "pro"
}

In an online request inspector, you would verify the method, auth header, content type, event type, and request body before comparing them to your handler or API expectations.

FAQ

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