web.config

<?xml version="1.0"?>
<configuration>
  <system.webServer>
  
    <defaultDocument enabled="true">
      <files>
        <add value="index.html" />
      </files>
    </defaultDocument>

    <rewrite>
      <rules>
        <rule name="React Routes" stopProcessing="true">
          <match url=".*" />
          <conditions logicalGrouping="MatchAll">
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
            <add input="{REQUEST_URI}" pattern="^/(api)" negate="true" />
          </conditions>
          <action type="Rewrite" url="/" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>