Fall back to getallheaders() when available

[tuupola]

When sending something else than valid Authorization: Basic header PHP will not set the HTTP_AUTHORIZATION environment. Because of this the Authorization header is not available via $request->getHeader("Authorization"). See #1784, #1616.

This is problematic when you are using Authorization: Bearer or something similar. Usual workaround is to add the following rewrite rule.

RewriteRule .* - [env=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

However even without the workaround, the header is however available via getallheaders(). This PR adds a fallback call to getallheaders() when it is available and HTTP_AUTHORIZATION is not set.

[coveralls]

Coverage increased (+0.08%) to 88.05% when pulling 3dc2c14 on tuupola:getallheaders-fallback into 954472c on slimphp:3.x.

[coveralls]

Coverage increased (+0.08%) to 88.05% when pulling 76b6598 on tuupola:getallheaders-fallback into 954472c on slimphp:3.x.

[akrabat]

I would prefer a more specific method name.

[coveralls]

Coverage increased (+7.8%) to 95.823% when pulling dc3cb63 on tuupola:getallheaders-fallback into 954472c on slimphp:3.x.