Clean up and start work on Epiphany plugin

plugin/src/HttpResponse.lua

@@ -1,8 +1,18 @@
 local HttpService = game:GetService("HttpService")
 
+local stringTemplate = [[
+HttpResponse {
+	code: %d
+	body: %s
+}]]
+
 local HttpResponse = {}
 HttpResponse.__index = HttpResponse
 
+function HttpResponse:__tostring()
+	return stringTemplate:format(self.code, self.body)
+end
+
 function HttpResponse.new(body)
 	local response = {
 		body = body,
@@ -13,6 +23,20 @@ function HttpResponse.new(body)
 	return response
 end
 
+function HttpResponse.fromRobloxResponse(response)
+	local self = {
+		body = response.Body,
+		code = response.StatusCode,
+		headers = response.Headers,
+	}
+
+	return setmetatable(self, HttpResponse)
+end
+
+function HttpResponse:isSuccess()
+	return self.code >= 200 and self.code < 300
+end
+
 function HttpResponse:json()
 	return HttpService:JSONDecode(self.body)
 end