feature: add apisix-version info to headers in APISIX core (#1961)

related #1877

apisix/init.lua

@@ -23,7 +23,7 @@ local service_fetch = require("apisix.http.service").get
 local admin_init    = require("apisix.admin.init")
 local get_var       = require("resty.ngxvar").fetch
 local router        = require("apisix.router")
-local set_upstream = require("apisix.upstream").set_by_route
+local set_upstream  = require("apisix.upstream").set_by_route
 local ipmatcher     = require("resty.ipmatcher")
 local ngx           = ngx
 local get_method    = ngx.req.get_method
@@ -40,6 +40,7 @@ local load_balancer
 local local_conf
 local dns_resolver
 local lru_resolved_domain
+local ver_header    = "APISIX/" .. core.version.VERSION
 
 
 local function parse_args(args)
@@ -301,6 +302,8 @@ function _M.http_access_phase()
 
     core.ctx.set_vars_meta(api_ctx)
 
+    core.response.set_header("Server", ver_header)
+
     -- load and run global rule
     if router.global_rules and router.global_rules.values
        and #router.global_rules.values > 0 then

t/node/remote-addr-ipv6.t

@@ -114,6 +114,7 @@ request sent: 59
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: 
 received: hello world

t/plugin/redirect.t

@@ -669,6 +669,7 @@ sent http request: 58 bytes.
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: \nreceived: hello world
 close: 1 nil}

t/router/multi-ssl-certs.t

@@ -160,6 +160,7 @@ sent http request: 62 bytes.
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: \nreceived: hello world
 close: 1 nil}

t/router/radixtree-sni.t

@@ -160,6 +160,7 @@ sent http request: 62 bytes.
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: \nreceived: hello world
 close: 1 nil}
@@ -313,6 +314,7 @@ sent http request: 62 bytes.
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: \nreceived: hello world
 close: 1 nil}
@@ -426,6 +428,7 @@ sent http request: 58 bytes.
 received: HTTP/1.1 200 OK
 received: Content-Type: text/plain
 received: Connection: close
+received: Server: APISIX/\d\.\d+(\.\d+)?
 received: Server: \w+
 received: \nreceived: hello world
 close: 1 nil}