proxy: don't append predefined headers

fix issue #1086
Signed-off-by: Tw <tw19881113@gmail.com>

Signed-off-by: Tw <tw19881113@gmail.com>

* Support for configurable connection pool.

* ensure positive integer pool size config

* Remove unnecessary config options from systemd service so it will work with earlier versions of systemd. Simplify the systemd service instructions and make them more complete.

* Minor systemd README improvements.

* Add back some of the optional systemd 229 stuff but commented out for compat.

* A bunch of updates to the README for linux systemd.

* Add the multipass plugin to the directives

* Fix gofmt

parser: fix broken absolute path imports (recursive case)

fix issue #1026
Signed-off-by: Tw <tw19881113@gmail.com>

awslambda external plugin

* keep fastcgi connection open

* poor mans serialisation to make up for the lack of demuxing

* pointing includes to echse's repo

* Revert "pointing includes to echse's repo"

This reverts commit 281daad8d437ba88fadd65fae5af2da99d449bea.

* switch for persistent fcgi connections on/off added

* fixing ineffectual assignments

* camel case instead of _

* only activate persistent sockets on windows (and some naming conventions/cleanup)

* gitfm import sorting

* Revert "fixing ineffectual assignments"

This reverts commit 79760344e7b1231e59a2867246e7689b05e92e18.

# Conflicts:
#	caddyhttp/staticfiles/fileserver.go

* added another mutex and deleting map entries. thx to mholts QA comments!

* thinking about it, this RW lock was not a good idea here

* thread safety

* I keep learning about mutexs in go

* some cosmetics

* Updated FreeBSD init script to allow the server to stop properly

* Fixed FreeBSD init script permissions

* Updated FreeBSD init script to allow the server to stop properly

This already happens in the getCertificate function, but doing it here
guarantees case insensitivity across the board for this handshake.

We renamed caddytls.ErrStorageNotFound to caddytls.ErrNotExist to more
closely mirror the os package. We changed it to an interface wrapper
so that the custom error message can be preserved. Returning only "data
not found" was useless in debugging because we couldn't know the
concrete value of the error (like what it was trying to load).

Users can do a type assertion to determine if the error value is a "not
found" error instead of doing an equality check.

A Caddyfile using *.example.com as its site address would be subject to
this bug at renewal time, as it would use the literal "*.example.com"
value instead of the name being passed in to obtain a certificate.
This change fixes the LoadSite call so that it looks in the proper
directory for the certificate resources.

Caddyfiles read from STDIN now have server types associated with them.

Most of these were fixed by handling errors that were previously
unhandled (oops).

* Support for lego's timeout option

* Changed IntVar to DurationVar for catimeout

* Modified catimeout according to mholt's comments

Use naoina/toml for MIT license. Make proxy_test work in any directory.

Some tests were running into this issue:
https://github.com/golang/go/issues/6895

Putting the sockets into temp dirs fixes the problem.

Add 'status' middleware instead of 'status' directive for 'rewrite' middleware