postman 无法获资源

postman里出错：
Could not get any response
There was an error connecting to http://larabbs.test/api/topics.
Why this might have happened:

• The server couldn't send a response:
  Ensure that the backend is working properly
• Self-signed SSL certificates are being blocked:
  Fix this by turning off 'SSL certificate verification' in Settings > General
• Proxy configured incorrectly
  Ensure that proxy is configured correctly in Settings > Proxy
• Request timeout:
  Change request timeout in Settings > General
  把地址http://larabbs.test/api/topics​ 复制到浏览器地址栏里打开是可以获得数据的。
  请问我的问题可能出在哪儿呢。