v0.35.1: performance, AGPL licensing and documentation overhaul

- Web Server reads static files inline; proxy middleware chain flattened
- About window with license summary and project links; AGPL-3.0-or-later
- Rewritten documentation: feature list, screenshots, performance guide
- Fix false spikes in per-Vhost request-rate charts

src/http3.rs

@@ -184,7 +184,7 @@ pub fn withdraw_advertisement(
     tls: bool,
     active: &[Listener],
 ) {
-    headers.remove("alt-svc");
+    headers.remove(::http::header::ALT_SVC);
     if tls
         && local.is_some_and(|local| {
             active
@@ -192,7 +192,7 @@ pub fn withdraw_advertisement(
                 .any(|binding| binding.matches(local, true) && binding.http3.is_some())
         })
     {
-        headers.insert("alt-svc", HeaderValue::from_static("clear"));
+        headers.insert(::http::header::ALT_SVC, HeaderValue::from_static("clear"));
     }
 }
 
@@ -204,7 +204,7 @@ pub fn advertise(
     desired: &[Listener],
     host_http3_enabled: bool,
 ) {
-    headers.remove("alt-svc");
+    headers.remove(::http::header::ALT_SVC);
     if !tls {
         return;
     }
@@ -225,7 +225,7 @@ pub fn advertise(
     if let Some(settings) = settings {
         let value = format!("h3=\":{}\"; ma={}", local.port(), settings.alt_svc_max_age);
         if let Ok(value) = HeaderValue::from_str(&value) {
-            headers.insert("alt-svc", value);
+            headers.insert(::http::header::ALT_SVC, value);
         }
     }
 }
@@ -436,7 +436,7 @@ async fn connection_loop(
                             );
                             send.stop_stream(Code::H3_MESSAGE_ERROR);return;
                         }
-                        let expected=request.headers().get("content-length").and_then(|v|v.to_str().ok()).and_then(|v|v.parse::<u64>().ok());
+                        let expected=request.headers().get(::http::header::CONTENT_LENGTH).and_then(|v|v.to_str().ok()).and_then(|v|v.parse::<u64>().ok());
                         let mut tunnel_receive=None;
                         let mut request=if websocket {
                             tunnel_receive=Some(receive);