Correction, the example I gave was not with my testing server. However,
they should both support the same version.

The command

$ nghttp2/src/nghttp -nvu http://10.0.0.110:8080/index.html

returns

[0.000] HTTP Upgrade request

GET /index.html HTTP/1.1

Host: 10.0.0.110:8080

Connection: Upgrade, HTTP2-Settings

Upgrade: h2c-14

HTTP2-Settings: AAMAAABkAAQAAP__

Accept: */*

User-Agent: nghttp2/0.6.3-DEV

[ERROR] Failed to parse HTTP Upgrade response header:
(HPE_INVALID_CONSTANT) invalid constant string

Some requests were not processed. total=1, processed=0

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Received on 2014-10-04