Add an HTTP wrapper to the gRPC daemon (#899)

* The daemon can spin up an http grpc server in parallel for web clients

* Go back to the non-hardcoded ip

* Add comment for exported server function

* Return the right header in the required header check for the daemon

* When the request errors, mention both headers otherwise the logic gets weird

* Remove extra newline

Co-authored-by: Tomer Elmalem <tomer@stripe.com>

go.mod

@@ -49,21 +49,25 @@ require (
 require (
 	github.com/hashicorp/go-hclog v1.2.1
 	github.com/hashicorp/go-plugin v1.4.4
+	github.com/improbable-eng/grpc-web v0.15.0
 	github.com/joho/godotenv v1.4.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
 	github.com/Microsoft/go-winio v0.5.2 // indirect
+	github.com/cenkalti/backoff/v4 v4.1.1 // indirect
 	github.com/chzyer/readline v1.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/desertbit/timer v0.0.0-20180107155436-c41aec40b27f // indirect
 	github.com/emirpasic/gods v1.18.1 // indirect
 	github.com/fsnotify/fsnotify v1.5.4 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/hashicorp/yamux v0.0.0-20211028200310-0bc27b27de87 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/klauspost/compress v1.11.7 // indirect
 	github.com/magiconair/properties v1.8.6 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
@@ -73,6 +77,7 @@ require (
 	github.com/onsi/gomega v1.10.1 // indirect
 	github.com/pelletier/go-toml/v2 v2.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rs/cors v1.7.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/src-d/gcfg v1.4.0 // indirect
 	github.com/subosito/gotenv v1.4.0 // indirect
@@ -81,4 +86,5 @@ require (
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.2 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
+	nhooyr.io/websocket v1.8.6 // indirect
 )