diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
new file mode 100644
index 0000000..72747f6
--- /dev/null
+++ b/.github/workflows/rust.yml
@@ -0,0 +1,23 @@
+name: Rust
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Build
+      run: cargo build --verbose
+    - name: Run tests
+      run: cargo test --verbose
diff --git a/Cargo.lock b/Cargo.lock
index 6644a46..7c6b9c6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -345,9 +345,9 @@ checksum = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 
 [[package]]
 name = "fltk"
-version = "1.2.7"
+version = "1.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0953c34fd5b0c6ac1b615fdcda8845c81ed364165b115ddac46ae8953d456640"
+checksum = "889d9b2176b88c6f8f90ba64b0b030e52807ed1d6e416df0c15611225b40cc1d"
 dependencies = [
  "bitflags",
  "fltk-sys",
@@ -356,9 +356,9 @@ dependencies = [
 
 [[package]]
 name = "fltk-sys"
-version = "1.2.7"
+version = "1.2.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2df700440c014123cc1644fbef7d33dcdda18cdd80373a7552a9d5cec47ca63"
+checksum = "e38b2f3fb23b4bd46fc492d5d8d099b0bf766a7ab5d18b8424d93089ae934a48"
 dependencies = [
  "cmake",
 ]
diff --git a/README.md b/README.md
index ebbd3fe..28617be 100644
--- a/README.md
+++ b/README.md
@@ -226,4 +226,4 @@ For now, either email me (if you know me personally) or make a pull request to a
 PTTH is licensed under the
 [GNU AGPLv3](https://www.gnu.org/licenses/agpl-3.0.html)
 
-Copyright 2020 "Trish"
+Copyright 2020-2021 "Trish"
diff --git a/handlebars/relay/debug.hbs b/handlebars/relay/debug.hbs
index f89e422..b71df54 100644
--- a/handlebars/relay/debug.hbs
+++ b/handlebars/relay/debug.hbs
@@ -52,8 +52,6 @@ Lorem ipsum dolor set amet
 <p>
 <a href="endless_sink">Data sink (POST only)</a>
 
-<p>Persistent toggle is <pre>{{persistent_toggle}}</pre></p>
-
 <form action="toggle" method="post">
 <input type="submit" value="Toggle">
 </form>
diff --git a/handlebars/relay/root.hbs b/handlebars/relay/root.hbs
index 98391fa..6d21b64 100644
--- a/handlebars/relay/root.hbs
+++ b/handlebars/relay/root.hbs
@@ -14,6 +14,10 @@
 	.entry_list div:nth-child(odd) {
 		background-color: #ddd;
 	}
+	.fine {
+		color: #444;
+		font-size: 12px;
+	}
 </style>
 <title>PTTH relay</title>
 </head>
@@ -33,5 +37,12 @@
 
 </div>
 
+<p class="fine">
+Rendered by PTTH relay server.
+Copyright 2020-2021 "Trish" ReactorScram. Licensed under the 
+<a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU AGPLv3.</a>
+<a href="https://six-five-six-four.com/git/reactor/ptth">Download source code</a>
+</p>
+
 </body>
 </html>
diff --git a/handlebars/relay/server_list.hbs b/handlebars/relay/server_list.hbs
index 04ef3f1..84376a8 100644
--- a/handlebars/relay/server_list.hbs
+++ b/handlebars/relay/server_list.hbs
@@ -95,6 +95,13 @@ Git version: {{git_version}}
 {{else}}
 Not built from Git
 {{/if}}
+
+<p>
+Rendered by PTTH relay server.
+Copyright 2020-2021 "Trish" ReactorScram. Licensed under the 
+<a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU AGPLv3.</a>
+<a href="https://six-five-six-four.com/git/reactor/ptth">Download source code</a>
+</p>
 </div>
 
 </body>
diff --git a/handlebars/server/file_server_dir.html b/handlebars/server/file_server_dir.html
index aca7991..857daca 100644
--- a/handlebars/server/file_server_dir.html
+++ b/handlebars/server/file_server_dir.html
@@ -27,6 +27,10 @@ AIABAACAAQAAgAEAAIABAACAAQAAgAEAAIABAACAAQAA" rel="icon" type="image/x-icon" />
 		
 		transition: var(--dark-mode-transition);
 	}
+	.fine {
+		color: #444;
+		font-size: 12px;
+	}
 	.light_switch {
 		display: none;
 	}
@@ -40,7 +44,7 @@ AIABAACAAQAAgAEAAIABAACAAQAAgAEAAIABAACAAQAA" rel="icon" type="image/x-icon" />
 	.light_switch_label::before {
 		content: "[ ] ";
 	}
-	a {
+	.app a {
 		color: var(--main-link-color);
 		transition: var(--dark-mode-transition);
 	}
@@ -122,6 +126,15 @@ AIABAACAAQAAgAEAAIABAACAAQAAgAEAAIABAACAAQAA" rel="icon" type="image/x-icon" />
 
 <!-- Doesn't work perfectly yet -->
 <!--<label for="light_switch" class="light_switch_label">Dark mode</label>-->
-</page>
+
+</div>
+
+<p class="fine">
+Rendered by PTTH end server.
+Copyright 2020-2021 "Trish" ReactorScram. Licensed under the 
+<a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU AGPLv3.</a>
+<a href="https://six-five-six-four.com/git/reactor/ptth">Download source code</a>
+</p>
+
 </body>
 </html>
diff --git a/handlebars/server/file_server_root.html b/handlebars/server/file_server_root.html
index 7cd63df..f55aab5 100644
--- a/handlebars/server/file_server_root.html
+++ b/handlebars/server/file_server_root.html
@@ -15,6 +15,10 @@
 	.entry_list div:nth-child(even) {
 		background-color: #ddd;
 	}
+	.fine {
+		color: #444;
+		font-size: 12px;
+	}
 </style>
 <title>{{metrics_startup.server_name}}</title>
 </head>
@@ -22,10 +26,6 @@
 
 <h1>{{metrics_startup.server_name}}</h1>
 
-<h2>Gauges</h2>
-
-<p>RSS MiB: {{metrics_interval.rss_mib}}</p>
-
 <div class="entry_list">
 
 <div>
@@ -40,5 +40,12 @@
 
 </div>
 
+<p class="fine">
+Rendered by PTTH end server.
+Copyright 2020-2021 "Trish" ReactorScram. Licensed under the 
+<a href="https://www.gnu.org/licenses/agpl-3.0.html">GNU AGPLv3.</a>
+<a href="https://six-five-six-four.com/git/reactor/ptth">Download source code</a>
+</p>
+
 </body>
 </html>
diff --git a/prototypes/ptth_quic_client_gui/Cargo.toml b/prototypes/ptth_quic_client_gui/Cargo.toml
index 23b6df2..b5f7b81 100644
--- a/prototypes/ptth_quic_client_gui/Cargo.toml
+++ b/prototypes/ptth_quic_client_gui/Cargo.toml
@@ -10,7 +10,7 @@ license = "AGPL-3.0"
 [dependencies]
 anyhow = "1.0.38"
 blake3 = "1.0.0"
-fltk = "1.2.7"
+fltk = "1.2.8"
 quic_demo = { path = "../quic_demo" }
 quinn = "0.7.2"
 rand = "0.8.4"
diff --git a/prototypes/ptth_quic_client_gui/src/main.rs b/prototypes/ptth_quic_client_gui/src/main.rs
index ad1c3f6..13c23f7 100644
--- a/prototypes/ptth_quic_client_gui/src/main.rs
+++ b/prototypes/ptth_quic_client_gui/src/main.rs
@@ -136,7 +136,9 @@ impl GuiClient <'_> {
 		ports_col: &mut Flex,
 		fltk_tx: fltk::app::Sender <Message>
 	) {
-		if self.ports.len () >= 5 {
+		const MAX_PORTS: usize = 15;
+		
+		if self.ports.len () >= MAX_PORTS {
 			return;
 		}
 		
@@ -151,7 +153,7 @@ impl GuiClient <'_> {
 		
 		self.ports.push (port);
 		
-		if self.ports.len () >= 5 {
+		if self.ports.len () >= MAX_PORTS {
 			self.but_add_port.deactivate ();
 		}
 	}
@@ -224,7 +226,7 @@ fn main () -> anyhow::Result <()> {
 	let connection_p2_p3 = rt.block_on (async move {
 		let server_cert = match opt.cert_url.as_ref () {
 			Some (url) => reqwest::get (url).await?.bytes ().await?,
-			None => tokio::fs::read ("ptth_quic_output/quic_server.crt").await?.into (),
+			None => tokio::fs::read ("ptth_quic_output/quic_server.crt").await.context ("can't read quic_server.crt from disk")?.into (),
 		};
 		
 		let endpoint = make_client_endpoint ("0.0.0.0:0".parse ()?, &[&server_cert])?;
diff --git a/todo.md b/todo.md
index e793417..186130c 100644
--- a/todo.md
+++ b/todo.md
@@ -1,6 +1,7 @@
 Interesting issues will get a unique ID with
 `dd if=/dev/urandom bs=5 count=1 | base32`
 
+- PTTH_QUIC: Report errors on client GUI (At least whether it's P2 or P4)
 - Fix long-running downloads restarting in the middle
 - [DMX6CO4G](issues/2021-01Jan/status-DMX6CO4G.md) fire-and-forget logs / key-value status data
 - ptth_tail