web.config

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<location path="." inheritInChildApplications="false">
  <system.webServer>
  <rewrite>
    <rules>
      <rule name="ReactRouter 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="^/(assets|tools|docs)" negate="true" />
        </conditions>
        <action type="Rewrite" url="index.html" />
      </rule>
    </rules>
  </rewrite>
</system.webServer>
</location>
</configuration>