title: nginx config add location lead error
body: <p>I met a problem about Nginx really make me confused.
  if I set the server as blow :</p>
  
  <pre><code>server {
      listen 80;
      server_name _;
      root /usr/project/exchange/front/build;
      index index.html;
      location = /{
              try_files $uri $uri/ =404;
      }
  </code></pre>
  
  <p>}</p>
  
  <p>if I add location / in the server. the page shows error.</p>
  
  <pre><code>server {
      listen 80;
      server_name _;
      root /usr/project/exchange/front/build;
      index index.html;
      location = /{
              try_files $uri $uri/ =404;
      }
      location / {
              proxy_pass http://127.0.0.1:8088;
      }
  </code></pre>
  
  <p>}</p>
  
  <p>That's really make confused. Nginx match the url from =/ to /?Why add location / leads to mistake?</p>