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HTTP/2 over TLS and HTTP/2 over Cleartext TCP for HTTP/2

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Posted on 2025-9-22 20:02:51 | | | |
HTTP/1.x and HTTP/2 protocols are compared
https://www.itsvse.com/thread-10023-1-1.html

HTTPS(h2) and HTTP(h2c)

Like HTTP/1.x, HTTP/2 includes HTTPS with TLS and HTTP without TLS.

HTTPS (HTTP/2 over TLS)

Encrypt communication using TLS
The identifier is h2
Example protocol:https

HTTP (HTTP/2 over cleartext TCP)

Communicate in plaintext without using TLS
The identifier is H2C
Example protocol:http

Since most common browsers only support H2, it is essentially necessary. TLS used in H2 has the following requirements:

  • TLS 1.2 or later
  • SNI extension support is required
  • The client must indicate the target domain name during TLS negotiation.
  • For TLS 1.2, the following cipher suite requirements apply:
  • Do not use the blacklisted cipher suites in RFC 7540
  • Support TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 required


All major browsers (Chrome, Firefox, Safari, Edge, etc.).Only H2 (encrypted version) is implemented and supported, not H2C。

ASP.NET Core sets up the H2C protocol

The configuration is as follows:

The hardcode is as follows:

Test code:

As shown below:



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