diff --git a/source/logic/backend.ts b/source/logic/backend.ts
index 6ae5b70..be323db 100644
--- a/source/logic/backend.ts
+++ b/source/logic/backend.ts
@@ -171,13 +171,13 @@ namespace _zeitbild.frontend_web.backend
 	/**
 	 */
 	export async function session_prepare(
+		input : any
 	) : Promise<{kind : string; data : any;}>
 	{
 		return call(
-			lib_plankton.http.enum_method.get,
+			lib_plankton.http.enum_method.post,
 			"/session/prepare",
-			{
-			}
+			input
 		);
 	}
 	
diff --git a/source/logic/conf.ts b/source/logic/conf.ts
index c2b89ac..dbc7950 100644
--- a/source/logic/conf.ts
+++ b/source/logic/conf.ts
@@ -42,7 +42,22 @@ namespace _zeitbild.frontend_web.conf
 				],
 				"additionalProperties": false,
 				"default": {}
-			}
+			},
+			"misc": {
+				"nullable": false,
+				"type": "object",
+				"properties": {
+					"oidc_redirect_uri_template": {
+						"nullable": true,
+						"type": "string",
+						"default": "http://localhost:8888/#oidc_finish,session_key={{session_key}}"
+					},
+				},
+				"required": [
+				],
+				"additionalProperties": false,
+				"default": {}
+			},
 		},
 		"required": [
 			"version",
diff --git a/source/pages/login/logic.ts b/source/pages/login/logic.ts
index e1af974..9d0c6ab 100644
--- a/source/pages/login/logic.ts
+++ b/source/pages/login/logic.ts
@@ -7,6 +7,9 @@ namespace _zeitbild.frontend_web.pages
 		"login",
 		async (parameters, target_element) => {
 			const preparation : {kind : string; data : any;} = await _zeitbild.frontend_web.backend.session_prepare(
+				{
+					"oidc_redirect_uri_template": _zeitbild.frontend_web.conf.get()["misc"]["oidc_redirect_uri_template"],
+				}
 			);
 			switch (preparation.kind) {
 				case "internal": {