fix: server function custom errors set status codes (#4782)

* fix: handling status codes from errors

* add demo

* clippy + check

* fix clippy again

Cargo.toml

@@ -699,6 +699,11 @@ name = "flat_router"
 path = "examples/06-routing/flat_router.rs"
 doc-scrape-examples = true
 
+[[example]]
+name = "server_functions"
+path = "examples/07-fullstack/server_functions.rs"
+doc-scrape-examples = true
+
 [[example]]
 name = "middleware"
 path = "examples/07-fullstack/middleware.rs"