Better error message for invalid url format

app/controllers/links_controller.rb

@@ -13,7 +13,8 @@ def create
     if link.save
       render json: {id: link.share_id, url: link.share_url(base_share_url)}, status: :created
     else
-      render json: {error: "Your link could not be created"}, status: :unauthorized
+      error = link.errors.any? ? link.errors.full_messages.join(", ") : "Unknown error"
+      render json: {error: error}, status: :unprocessable_entity
     end
   end
 

spec/requests/links_spec.rb

@@ -13,6 +13,12 @@
       expect(response).to have_http_status(:created)
     end
 
+    it "will return unprocessable_entity if the link is not valid" do
+      post "/", params: {url: "scottw.com"}
+      expect(response).to have_http_status(:unprocessable_entity)
+      expect(json["error"]).to match(/Invalid Host/)
+    end
+
     it "will add a new link with a custom URL" do
       ENV["SHORTI_BASE_URL"] = "https://shorti.shorti/"
       post "/", params: {url: "https://scottw.com"}