What version of Go are you using (go version)?

$ go version
go version go1.15.1 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/adelicia/Library/Caches/go-build"
GOENV="/Users/adelicia/Library/Application Support/go/env"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/adelicia/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/adelicia/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/1v/60bjrxr975b8_gm7rx8_0zyr0000gn/T/go-build688238576=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

I'm making an HTTP request to the go backend server which fetches the record from mongodb atlas database.
Database contains just one record:

GetProfile returns UserProfile user

func GetProfile(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Access-Control-Allow-Origin", "*")
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Access-Control-Allow-Methods", "GET")
params := mux.Vars(r)
var user models.UserProfile
fmt.Println("getProfile for : ", params["uid"])
filter := bson.M{"uid": params["uid"]}
err := collection.FindOne(context.Background(), filter).Decode(&user)
if err != nil {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte({ "message": " + err.Error() + " }))
return
// user = createUser(params["uid"])
}
json.NewEncoder(w).Encode(user)
}

router snippet

router := mux.NewRouter()
router.HandleFunc("/api/userProfile/{uid}", middleware.GetProfile).Methods("GET", "OPTIONS")

data-struct

type UserProfile struct {
ID primitive.ObjectID json:"_id" bson:"_id"
UserID string json:"uid" bson:"uid"
Pantry []string json:"pantry" bson:"pantry"
Cart []string json:"cart" bson:"cart"
Favourites []string json:"fav" bson:"fav"
}

What did you expect to see?

url in postman: http://localhost:8080/api/userProfile/aditit@andrew.cmu.edu

What did you see instead?