You call the following URL in your browser: https://sapes5.

The URL shown is an OData service endpoint exposed from the SAP ES5 Gateway demo system:

https://sapes5.sapdevcenter.com/sap/opu/odata/iwbep/GWSAMPLE_BASIC/ProductSet( 'HT-1000')/ToSalesOrderLineltems

OData services in SAP Gateway return XML responses by default when called in a browser, unless otherwise specified by request headers (like JSON format).

The structure follows AtomPub/Atom XML representation, showing entity details and navigation properties.

Therefore, the file type displayed in the browser is XML, not HTML, Java, or PHP.