WrapCGI might not work with non-buffering PSGI server

[miyagawa]

I was reading the code of WrapCGI and the current code that does read from psgi.input uses the diamond operator to read the whole input from filehandles, which will probably not work with PSGI servers where input buffering is off (uwsgi for instance).

https://github.com/plack/Plack/blob/master/lib/Plack/App/WrapCGI.pm#L12-L17

[ccodewa]

apache 2.4 mod_perl 2.09
Plack::Handler::Apache2
Plack::App::WrapCGI with execute => 1

[Fri Jan 29 23:37:38.694671 2016] [mpm_prefork:notice] [pid 6397] AH00163: Apache/2.4.16 (FreeBSD) OpenSSL/1.0.1p-freebsd mod_perl/2.0.9 Perl/v5.20.2 configured -- resuming normal operations
[Fri Jan 29 23:37:38.694714 2016] [core:notice] [pid 6397] AH00094: Command line: '/usr/local/sbin/httpd -D NOHTTPACCEPT'
[Fri Jan 29 23:37:47.155331 2016] [perl:error] [pid 6400] [client 127.0.0.1:16738] Not a GLOB reference at /usr/local/lib/perl5/site_perl/Plack/App/WrapCGI.pm line 15.\n
[Fri Jan 29 23:37:48.122626 2016] [perl:error] [pid 6401] [client 127.0.0.1:48978] Not a GLOB reference at /usr/local/lib/perl5/site_perl/Plack/App/WrapCGI.pm line 15.\n

• Apache works without execute => 1
• Plackup works with execute => 1
• Apache 2.2 mod_perl 2.05 on ubuntu 12.02 server works with execute => 1