Added API + Gateway support for arbitrary HTTP headers

This commit fixes + improves CORS support

License: MIT
Signed-off-by: Juan Batiz-Benet <juan@benet.ai>

config/api.go

@@ -0,0 +1,5 @@
+package config
+
+type API struct {
+	HTTPHeaders map[string][]string // HTTP headers to return with the API.
+}

config/config.go

@@ -26,6 +26,7 @@ type Config struct {
 	Tour             Tour                  // local node's tour position
 	Gateway          Gateway               // local node's gateway server options
 	SupernodeRouting SupernodeClientConfig // local node's routing servers (if SupernodeRouting enabled)
+	API              API                   // local node's API settings
 	Swarm            SwarmConfig
 	Log              Log
 }

config/gateway.go

@@ -2,6 +2,7 @@ package config
 
 // Gateway contains options for the HTTP gateway server.
 type Gateway struct {
+	HTTPHeaders  map[string][]string // HTTP headers to return with the gateway
 	RootRedirect string
 	Writable     bool
 }