HTTP3 Test for a Website in Bulk

Enter your Website to find if HTTP3 is enabled or not.
Example site is HTTP/3 Enabled Website

Long Tail Keywords

S.NO. URL Header Size Total Size HTTP3 Enabled HTTP Response

HTTP3 is advanced and New Protocol version, and it is the fastest protocol as compared to HTTP/2 and HTTP/1.1 If your Website or Hosting supports HTTP/3 than your Website will load faster as compared to other Protocol. Above Test will make a CURL request to your website and will check the Header response if your Website can support HTTP/3 version or not. One Example of HTTP3 Header Response : alt-svc h3-24=":443"; ma=86400, h3-23=":443"; ma=86400 that confirms your website supports HTTP/3 Protocol.

Here's a comprehensive explanation of the HTTP/3 protocol, incorporating images for visual clarity:
HTTP/3: The Future of Web Communication

Key Characteristics:

Built on QUIC: Leverages the QUIC protocol for transport, which offers several advantages over TCP.
Faster: QUIC's features like connection establishment, multiplexing, and improved congestion control contribute to faster website loading and reduced latency.
More Reliable: Handles network changes and packet loss more gracefully, leading to less buffering and smoother user experiences.
More Secure: Integrates encryption into the transport layer, enhancing privacy and security.

How HTTP/3 Works:

Connection Establishment:
Client and server exchange QUIC handshake messages to establish a secure connection. This process can often be completed in a single round trip, reducing latency compared to TCP's multi-step handshake.

Multiple requests and responses can be sent over a single QUIC connection, improving efficiency and reducing overhead. This is similar to HTTP/2's multiplexing, but with potential for further optimization due to QUIC's underlying features. Image of Multiplexing in QUIC Opens in a new window

0-RTT (Zero Round Trip Time) Resumption:
Allows clients to send data to the server immediately upon connection resumption, without waiting for a response. This can significantly speed up loading times for previously visited websites.

Improved Congestion Control:
QUIC's congestion control algorithms are designed to be more adaptive and responsive to network conditions, reducing delays and improving overall performance.

Benefits of HTTP/3:

Faster Page Load Times.
More Reliable Connections.
Improved Security.
Better Performance on Mobile Networks.
Reduced Server Load.

Current State:

HTTP/3 became a proposed standard in June 2022. Major browsers and web servers already support it. Adoption is expected to increase rapidly in the coming years.


HTTP/3 is poised to revolutionize web communication, offering significant performance, reliability, and security benefits. Its adoption will have a profound impact on the online experience, making the web faster, more secure, and more responsive for everyone.