🏷️ Headers

Headers wraps around your current Response and sets all the headers parsed in the headers parameter provided they are not set. If a header was already set by a previous Response, then it will be skipped.

func Cors(configuration CorsConfiguration) there.Middleware {
    return func(request there.Request, next there.Response) there.Response {
        headers := map[string]string{
            header.ResponseAccessControlAllowOrigin:  configuration.AccessControlAllowOrigin,
            header.ResponseAccessControlAllowMethods: configuration.AccessControlAllowMethods,
            header.ResponseAccessControlAllowHeaders: configuration.AccessControlAllowHeaders,
        }
        if request.Method == there.MethodOptions {
            return there.Headers(headers, there.Status(status.OK))
        }
        return there.Headers(headers, next)
    }
}

When this middleware gets called, all the Cors Headers will be set.

func Headers(headers map[string]string, response Response) Response {
    return &headerResponse{headers: headers, response: response}
}

type headerResponse struct {
    headers  map[string]string
    response Response
}

func (h headerResponse) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
    for key, value := range h.headers {
        // Only set the header, if it wasn't set yet
        if len(rw.Header().Get(key)) == 0 {
            rw.Header().Set(key, value)
        }
    }
    if h.response != nil {
        h.response.ServeHTTP(rw, r)
    }
}