Hello,
this is the error message in the log:
[mod_spdy/0.9.4.1-0] [39088:-2124398144:WARNING:mod_spdy.cc(440)] NPN didn't happen during SSL handshake.  You're probably using a version of mod_ssl that doesn't support NPN. Without NPN support, the server cannot use SPDY. See http://code.google.com/p/mod-spdy/wiki/GettingStarted for more information on installing a version of mod_spdy with NPN support. 
mod_ssl was built by the script build_modssl_with_npn.sh new and integrated into the Apaches.
Server Operating System: FreeBSD 8.4-RELEASE-p3 
And if it is of interest: OpenSSL 0.9.8y February 5, 2013
Can anyone help to eliminate the error? 
Greeting en001
What version/revision number of mod_spdy are you using?
mod_spdy-0.9.4.1
What version of Apache are you using, and on what operating system?  (Use
`apache2ctl -v` to check.)
apache-2.2.26
What other Apache modules are you using?  (Use `apache2ctl -M` to check.)
Loaded Modules:
 core_module (static)
 mpm_prefork_module (static)
 http_module (static)
 so_module (static)
 authn_file_module (shared)
 authn_anon_module (shared)
 authn_default_module (shared)
 authn_alias_module (shared)
 authz_host_module (shared)
 authz_groupfile_module (shared)
 authz_user_module (shared)
 authz_owner_module (shared)
 authz_default_module (shared)
 auth_basic_module (shared)
 reqtimeout_module (shared)
 include_module (shared)
 filter_module (shared)
 charset_lite_module (shared)
 deflate_module (shared)
 log_config_module (shared)
 logio_module (shared)
 env_module (shared)
 mime_magic_module (shared)
 expires_module (shared)
 headers_module (shared)
 unique_id_module (shared)
 setenvif_module (shared)
 ssl_module (shared)
 mime_module (shared)
 status_module (shared)
 autoindex_module (shared)
 info_module (shared)
 suexec_module (shared)
 cgi_module (shared)
 negotiation_module (shared)
 dir_module (shared)
 actions_module (shared)
 userdir_module (shared)
 alias_module (shared)
 rewrite_module (shared)
 spdy_module (shared)