【Chrome/Ajax/ローカルサーバー】これが出たらやる9つのこと「XMLHttpRequest cannot load localhost:3000/sub/comments. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource」

【Chrome/Ajax/ローカルサーバー】これが出たらやる9つのこと「XMLHttpRequest cannot load localhost:3000/sub/comments. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource」

【Chrome/Ajax/ローカルサーバー】これが出たらやる9つのこと「XMLHttpRequest cannot load localhost:3000/sub/comments. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource」

【Chrome/Ajax/ローカルサーバー】これが出たらやる9つのこと「XMLHttpRequest cannot load localhost:3000/sub/comments. Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource」