diff --git a/crates/ptth_server/src/bin/ptth_server.rs b/crates/ptth_server/src/bin/ptth_server.rs
index 53ba1f2..1b61058 100644
--- a/crates/ptth_server/src/bin/ptth_server.rs
+++ b/crates/ptth_server/src/bin/ptth_server.rs
@@ -19,6 +19,9 @@ struct Opt {
 	#[structopt (long)]
 	auto_gen_key: bool,
 	
+	#[structopt (long)]
+	simulate_slow_upload: bool,
+	
 	#[structopt (long)]
 	file_server_root: Option <PathBuf>,
 	
@@ -85,8 +88,9 @@ async fn main () -> Result <(), anyhow::Error> {
 	let config_file = ptth_server::ConfigFile {
 		name: opt.name.or (config_file.name).expect ("`name` must be provided in command line or config file"),
 		api_key: config_file.api_key,
-		relay_url: opt.relay_url.or (config_file.relay_url).expect ("`relay_url` must be provided in command line of config file"),
+		relay_url: opt.relay_url.or (config_file.relay_url).expect ("`relay_url` must be provided in command line or config file"),
 		file_server_root: opt.file_server_root.or (config_file.file_server_root),
+		simulate_slow_upload: opt.simulate_slow_upload,
 	};
 	
 	if opt.print_tripcode {
diff --git a/crates/ptth_server/src/lib.rs b/crates/ptth_server/src/lib.rs
index 0c6efc1..bb5e852 100644
--- a/crates/ptth_server/src/lib.rs
+++ b/crates/ptth_server/src/lib.rs
@@ -149,15 +149,27 @@ async fn handle_req_resp (
 // type to load an incomplete file, as long as the command line options
 // complete it.
 
-#[derive (Default)]
+#[derive (Clone)]
 pub struct ConfigFile {
 	pub name: String,
 	pub api_key: String,
 	pub relay_url: String,
 	pub file_server_root: Option <PathBuf>,
+	pub simulate_slow_upload: bool,
 }
 
 impl ConfigFile {
+	#[must_use]
+	pub fn new (name: String, api_key: String, relay_url: String) -> Self {
+		Self {
+			name,
+			api_key,
+			relay_url,
+			file_server_root: None,
+			simulate_slow_upload: false,
+		}
+	}
+	
 	#[must_use]
 	pub fn tripcode (&self) -> String {
 		base64::encode (blake3::hash (self.api_key.as_bytes ()).as_bytes ())
@@ -317,12 +329,11 @@ mod tests {
 	
 	#[test]
 	fn tripcode_algo () {
-		let config = ConfigFile {
-			name: "TestName".into (),
-			api_key: "PlaypenCausalPlatformCommodeImproveCatalyze".into (),
-			relay_url: "".into (),
-			file_server_root: None,
-		};
+		let config = ConfigFile::new (
+			"TestName".into (),
+			"PlaypenCausalPlatformCommodeImproveCatalyze".into (),
+			"".into (),
+		);
 		
 		assert_eq! (config.tripcode (), "A9rPwZyY89Ag4TJjMoyYA2NeGOm99Je6rq1s0rg8PfY=".to_string ());
 	}
diff --git a/src/main.rs b/src/main.rs
index cce7c79..b7bd88a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -74,12 +74,11 @@ async fn main () -> anyhow::Result <()> {
 	
 	let relay_url = format! ("http://127.0.0.1:{}", proxy_port);
 	
-	let config_file = ptth_server::ConfigFile {
-		name: server_name.into (),
-		api_key: api_key.into (),
-		relay_url: format! ("{}/7ZSFUKGV", relay_url),
-		file_server_root: None,
-	};
+	let config_file = ptth_server::ConfigFile::new (
+		server_name.into (),
+		api_key.into (),
+		format! ("{}/7ZSFUKGV", relay_url),
+	);
 	
 	let (stop_server_tx, stop_server_rx) = oneshot::channel ();
 	let task_server = {
diff --git a/src/tests.rs b/src/tests.rs
index 050decd..657702a 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -147,12 +147,11 @@ impl TestingRelay {
 
 impl TestingServer {
 	async fn new (testing_config: &TestingConfig) -> Self {
-		let config_file = ptth_server::ConfigFile {
-			name: testing_config.server_name.into (),
-			api_key: testing_config.api_key.into (),
-			relay_url: format! ("{}/7ZSFUKGV", testing_config.relay_url ()),
-			file_server_root: None,
-		};
+		let config_file = ptth_server::ConfigFile::new (
+			testing_config.server_name.into (),
+			testing_config.api_key.into (),
+			format! ("{}/7ZSFUKGV", testing_config.relay_url ()),
+		);
 		
 		let (stop_tx, stop_rx) = oneshot::channel ();
 		let task = {