This change adds some security headers like Content-Security-Policy.
It does not set the HSTS header because Content-Security-Policy prevents
mixed HTTP and HTTPS content and the server does not use cookies.
However it is a header which could be added later on.
It also moves some header added by #5805 from a vendored file
to a generic handler.
Fixes ##5813
Some HTTP security headers in Minio.
To avoid problems with XSS and Clickjacking attacks.
X-Frame-Options
X-Frame-Options response header improve the protection
of web applications against Clickjacking. It declares a
policy communicated from a host to the client browser
on whether the browser must not display the transmitted
content in frames of other web pages.
X-XSS-Protection
This header enables the Cross-site scripting (XSS) filter in your browser.
rpc/v2/json2 code has a bug where it treats all jsonrpc 2.0
request params like an 'object'. In accordance with the spec
it could be both 'object' or an 'array'.
Handle both cases.
Andreas Auernhammer
rwagner_inf
Harshavardhana
Krishna Srinivas
Harshavardhana