You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: custom_header_test.go
    path of file: ./repos/vault/http
    
    the code of the file until where you have to start completion: // Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: BUSL-1.1

package http

import (
	"testing"

	"github.com/hashicorp/vault/vault"
)

var defaultCustomHeaders = map[string]string{
	"Strict-Transport-Security": "max-age=1; domains",
	"Content-Security-Policy":   "default-src 'others'",
	"X-Custom-Header":           "Custom header value default",
	"X-Frame-Options":           "Deny",
	"X-Content-Type-Options":    "nosniff",
	"Content-Type":              "application/json",
	"X-XSS-Protection":          "1; mode=block",
}

var customHeader2xx = map[string]string{
	"X-Custom-Header": "Custom header value 2xx",
}

var customHeader200 = map[string]string{
	"Someheader-200":  "200",
	"X-Custom-Header": "Custom header value 200",
}

var customHeader4xx = map[string]string{
	"Someheader-4xx": "4xx",
}

var customHeader400 = map[string]string{
	"Someheader-400": "400",
}

var customHeader405 = map[string]string{
	"Someheader-405": "405",
}

var CustomResponseHeaders = map[string]map[string]string{
	"default": defaultCustomHeaders,
	"307":     {"X-Custom-Header": "Custom header value 307"},
	"3xx": {
		"X-Custom-Header":     "Custom header value 3xx",
		"X-Vault-Ignored-3xx": "Ignored 3xx"
    
func TestCustomResponseHeaders(t *testing.T) {
	core, _, token := vault.TestCoreWithCustomResponseHeaderAndUI(t, CustomResponseHeaders, true)
	ln, addr := TestServer(t, core)
	defer ln.Close()
	TestServerAuth(t, addr, token)

	resp := testHttpGet(t, token, addr+"/v1/sys/raw/")
	testResponseStatus(t, resp, 404)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)

	resp = testHttpGet(t, token, addr+"/v1/sys/seal")
	testResponseStatus(t, resp, 405)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)
	testResponseHeader(t, resp, customHeader405)

	resp = testHttpGet(t, token, addr+"/v1/sys/leader")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpGet(t, token, addr+"/v1/sys/health")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpGet(t, token, addr+"/v1/sys/generate-root/attempt")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpGet(t, token, addr+"/v1/sys/generate-root/update")
	testResponseStatus(t, resp, 400)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)
	testResponseHeader(t, resp, customHeader400)

	resp = testHttpGet(t, token, addr+"/v1/sys/")
	testResponseStatus(t, resp, 404)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)

	resp = testHttpGet(t, token, addr+"/v1/sys")
	testResponseStatus(t, resp, 404)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)

	resp = testHttpGet(t, token, addr+"/v1/")
	testResponseStatus(t, resp, 404)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)

	resp = testHttpGet(t, token, addr+"/v1")
	testResponseStatus(t, resp, 404)
	testResponseHeader(t, resp, defaultCustomHeaders)
	testResponseHeader(t, resp, customHeader4xx)

	resp = testHttpGet(t, token, addr+"/")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpGet(t, token, addr+"/ui")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpGet(t, token, addr+"/ui/")
	testResponseStatus(t, resp, 200)
	testResponseHeader(t, resp, customHeader200)

	resp = testHttpPost(t, token, addr+"/v1/sys/auth/foo", map[string]interface{}{
		"type":        "noop",
		"description": "foo",
	})
	testResponseStatus(t, resp, 204)
	testResponseHeader(t, resp, customHeader2xx)
}