Display the request in one go

Otherwise, concurrent requests can cause the output to be interleaved.

guix-data-service/web/server.scm

@@ -37,9 +37,10 @@
                 body)))
 
 (define (handler request body controller)
-  (format #t "~a ~a\n"
+  (display
+   (format #f "~a ~a\n"
            (request-method request)
-          (uri-path (request-uri request)))
+           (uri-path (request-uri request))))
   (apply values
          (run-controller controller request body)))