* Fixed HTTP/2 support for the proxy middleware

http.Transport instances whose TLSClientConfig, Dial, or DialTLS field
is non-nil will be configured without HTTP/2 support by default.

This commit adds the proper calls to http2.ConfigureTransport()
everywhere a http.Transport is created and thus fixes HTTP/2 in the
proxy middleware whenever insecure_skip_verify or keepalive is provided.

* Added HTTP/2 support check to TestReverseProxyInsecureSkipVerify

* Feature #1282 - Support pre-gzipped files

* Fix broken test cases

* Support brotli encoding as well

* Fix for #1276 - support integers and floats as metadata in markdown (#1278)

* Fix for #1276

* Use strconv.Format

* Use map[string]interface{} as variables

* One more file

* Always run all tests before commit

* Get rid of DocFlags

* Fix syntax in caddy.conf

* Update to Go 1.7.4

* Add send_timeout property to fastcgi directive.

* Convert rwc field on FCGIClient from type io.ReadWriteCloser to net.Conn.
* Return HTTP 504 to the client when a timeout occurs.
* In Handler.ServeHTTP(), close the connection before returning an HTTP
502/504.
* Refactor tests and add coverage.

* Return HTTP 504 when FastCGI connect times out.

* test: add unit test for #1283 (#1288)

* After review fixes

* Limit the number of restarts with systemd

* Prevent fd leak

* Prevent fd leak

* Refactor loops

* gofmt

* Fix for issue #1287 - hide hidden files

* Reuse IsHidden

* Fix failing tests

Add send_timeout property to fastcgi directive

Update to Go 1.7.4

Fix syntax in caddy.conf

* Convert rwc field on FCGIClient from type io.ReadWriteCloser to net.Conn.
* Return HTTP 504 to the client when a timeout occurs.
* In Handler.ServeHTTP(), close the connection before returning an HTTP
502/504.
* Refactor tests and add coverage.

* Fix for #1276

* Use strconv.Format

* Use map[string]interface{} as variables

* One more file

* Always run all tests before commit

* Get rid of DocFlags

* Fix for #1164 - allow only one header per line

* Include original reporter case

Fix read timeout and add default timeout values.

Increase code coverage (caddy.go)

* Fix issue #1258

* address comments

* add a test

* address comments 2

By setting the read deadline in streamReader.Read(), the deadline was
extended by the read timeout on each subsequent call. To avoid this, the
deadline is set in FCGIClient.Request(), before the first read occurs.

See #1094.

* INIT-systemd use CADDYPATH instatt of HOME

* INIT-upstart use CADDYPATH instatt of HOME

* INIT-upstart use CADDYPATH instatt of HOME

* INIT-upstart use CADDYPATH instatt of HOME

Sort the resulting slice before the comparison.

launchd service file for Mac

* Filter empty headers

Some web servers (e.g. Jetty 9.3) don’t like HTTP headers with empty values. This commit filters header replacements with zero length.

* Extend tests to verify removal of empty headers

* Handle add-header case

* Change - Use short variable assignment

* Make fastcgi load balanceable too

* Address one more corner case - invalid configuration fastcgi /

* After review fixes

* Simplify conditions

* Error message

* New fastcgi syntax

* golint will be happy

* Change syntax

proxy: record request Body for retry (fixes #1229)