!--a11y-->
Determining the Logon Language 
When you log onto the SAP system, you must select a language. The following describes the process according to which the logon language is determined.
The browser that is connected to the SAP Web Application Server as a client also has language settings. With Internet Explorer, you can set the language you require by choosing Tools ® Internet Options ® Languages.
The logon language for the SAP Web Application Server is set according to the following process.
...
1. In transaction SICF, if the service has set the flag Mandatory Logon Data, the system uses the language that was entered there.
2. If this is not the case, but the HTTP request contains the language in the HTTP header (as a header or a form field), you log onto the system using this language.
3. The system then takes the browser settings. The system selects as the logon language the first language from the list that is maintained in the browser, and which is also installed in the SAP system.
These are transferred using the HTTP header field accept-language.
4. If no language is defined by this process, the classic SAP system mechanisms are used. The logon language is based on the user settings (in transaction SU01) and if nothing is entered here, the default language of the SAP system is used automatically.
In the next section, read about testing the HTTP request handler.