Overview

HTTP2.Pro is a testing service that lets you verify whether a client or server supports the HTTP/2 protocol via a simple API call. It returns protocol negotiation results and connection metadata in JSON. Useful for automated CI checks to confirm your web server is properly serving HTTP/2.

Beginner Tip

No authentication is required. Send a GET request with a url parameter pointing to the server you want to test, and the API responds with whether HTTP/2 was negotiated. It is a single-endpoint API, making it very easy to learn from.

Available Data

The kind of data this API exposes, based on its documentation. We could not call the endpoint to confirm the exact field names.

HTTP2.Pro data via REST API

Example Response

Illustrative shape only — we were not able to call this endpoint (it requires credentials or exposes no public sample URL), so the fields below show the kind of data this API returns rather than a recorded response.

JSON Response · Illustrative
{
  "status": "success",
  "data": {
    "result": "Data from HTTP2.Pro",
    "description": "Test endpoints for client and server HTTP/2 protocol support",
    "timestamp": "2025-01-15T10:00:00Z"
  }
}

Field Reference

url The URL that was tested for HTTP/2 support.
h2 1 if HTTP/2 was negotiated successfully, 0 otherwise.
protocol The actual protocol negotiated (e.g., h2, http/1.1).
push 1 if HTTP/2 server push is supported, 0 otherwise.

Implementation Example

Calls a real endpoint of this API. Replace any placeholder credentials with your own key.

Request
const url = "https://http2.pro/doc/api";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data);

What Can You Build?

Note: These code examples are AI-generated and unverified. Always refer to the official API documentation for accurate usage.

Common Errors & Troubleshooting

Generated guidance based on this API's documentation, not observed by us. Treat it as a starting point and check against the provider's own error reference.

Timeout or connection error The target server is slow to respond or blocks external probes
Test with a well-known HTTPS domain like https://www.google.com first to confirm the API is working.
h2 field is false or 0 The target server does not support HTTP/2
This is an expected result, not an error — it means the server only supports HTTP/1.1.
400 Bad Request URL parameter is missing or malformed
Ensure the url parameter is present and properly URL-encoded.

Metadata Score Breakdown

Estimated from metadata — endpoint not independently tested

This score is estimated from observable metadata — HTTPS support, authentication model, declared CORS, and documentation reachability — because the API requires authentication or exposes no publicly testable endpoint. The five-signal breakdown is only shown for live-tested APIs.

Metadata estimate · endpoint not independently tested

Technical Specifications

Auth No Auth
HTTPS REQUIRED
CORS UNKNOWN
Category Development
Difficulty Beginner
Listing details not endpoint-verified

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