Deploying multiple versions of Angular app to Azure App Service

For anyone looking for a generic solution see below.

It does 2 things:

• Handle default language via redirect (our default language is de)
• Handle rewires for any language
  • it uses regex to capture the language part (2 character language string + slash) from the beginning of the path, for example de/ or en/
  • it then uses the capture group to rewrite the path

Note:

• This will not limit which language codes a user can request via url
• If you want to be specific which languages are supported you can replace the regex with the following to only support de + en + fr:
  ^((?:de|en|fr)\/).*

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
    <httpRedirect enabled="true">
      <add wildcard="/" destination="/de" />
    </httpRedirect>  
    <rewrite>
      <rules>
        <rule name="angular" stopProcessing="true">
          <match url="^(.{2}\/).*" />
          <conditions logicalGrouping="MatchAll">
            <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
            <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
          </conditions>
          <action type="Rewrite" url="/{R:1}" />
        </rule>
      </rules>
    </rewrite>
  </system.webServer>
</configuration>

We had also the problem for our i18n multi-languages website created by angular-cli.

What you need:

1) ensure that you have only 1 web.config in the root folder (not under ./fr or ./en)

2) ensure that your fr/index.html has the right base tag

<base href="/fr/">

3) ensure that your en/index.html has the right base tag

<base href="/en/">

4) the content of your unique web.config needs to include the following code:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
      <rewrite>
        <rules>
            <rule name="SPA Routes FR" stopProcessing="true">
                <match url="fr/.*" />
                <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" appendQueryString="true" url="fr/index.html" />
            </rule>
            <rule name="SPA Routes EN" stopProcessing="true">
                <match url="en/.*" />
                <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" appendQueryString="true" url="en/index.html" />
            </rule>
        </rules>
    </rewrite>
  </system.webServer>
</configuration>

The "appendQueryString" is needed if you have some query parameters with your URL.