Description of problem:
The version of OpenSSL in RHEL 7 currently only supports NPN. The HTTP/2 community is standardising around ALPN, which is only supported in OpenSSL 1.0.2.
As a result, the RHSCL httpd24 will not be interoperable with newer HTTP/2 clients attempting to upgrade TLS connections.
Version-Release number of selected component (if applicable):
test /CoreOS/httpd/mod_http2/smoke is working on RHEL-7.4 on architectures 1486372 with no problem. The test run on architecture aarch64 on RHEL-7.4 revealed known bug BZ#1429006. It seems that this bug is not caused by by change to ALPN protocol support because it appearing on RHEL-7.3 and earlier.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.