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/cache/range.rs

@@ -12,11 +12,11 @@ pub enum RangeSelection {
 }
 
 pub fn request_range(method: &Method, headers: &HeaderMap) -> RangeSelection {
-    let mut values = headers.get_all("range").iter();
+    let mut values = headers.get_all(::http::header::RANGE).iter();
     let Some(value) = values.next() else {
         return RangeSelection::None;
     };
-    if values.next().is_some() || headers.get_all("if-range").iter().count() > 1 {
+    if values.next().is_some() || headers.get_all(::http::header::IF_RANGE).iter().count() > 1 {
         return RangeSelection::Unsupported;
     }
     if method != Method::GET {
@@ -74,7 +74,7 @@ fn if_range_matches(headers: &HeaderMap, if_range: Option<&HeaderValue>) -> bool
             return false;
         }
         return headers
-            .get("etag")
+            .get(::http::header::ETAG)
             .and_then(|value| value.to_str().ok())
             .is_some_and(|etag| !etag.trim().starts_with("W/") && etag.trim() == candidate);
     }
@@ -82,7 +82,7 @@ fn if_range_matches(headers: &HeaderMap, if_range: Option<&HeaderValue>) -> bool
         return false;
     };
     headers
-        .get("last-modified")
+        .get(::http::header::LAST_MODIFIED)
         .and_then(|value| value.to_str().ok())
         .and_then(|value| httpdate::parse_http_date(value).ok())
         .is_some_and(|modified| modified <= candidate_date)
@@ -127,32 +127,29 @@ impl Hit {
         let full_len = self.body.len();
         self.response
             .headers_mut()
-            .insert("accept-ranges", HeaderValue::from_static("bytes"));
+            .insert(::http::header::ACCEPT_RANGES, HeaderValue::from_static("bytes"));
         self.response
             .extensions_mut()
             .insert(crate::compression::Skip);
         let Some((start, end)) = resolve_byte_range(range, full_len) else {
             *self.response.status_mut() = StatusCode::RANGE_NOT_SATISFIABLE;
             *self.response.body_mut() = Body::empty();
-            self.response.headers_mut().insert(
-                "content-range",
+            self.response.headers_mut().insert(::http::header::CONTENT_RANGE,
                 HeaderValue::from_str(&format!("bytes */{full_len}")).expect("generated range"),
             );
             self.response
                 .headers_mut()
-                .insert("content-length", HeaderValue::from_static("0"));
+                .insert(::http::header::CONTENT_LENGTH, HeaderValue::from_static("0"));
             return self;
         };
         let slice = self.body.slice(start..=end);
         *self.response.status_mut() = StatusCode::PARTIAL_CONTENT;
         *self.response.body_mut() = Body::from(slice.clone());
-        self.response.headers_mut().insert(
-            "content-range",
+        self.response.headers_mut().insert(::http::header::CONTENT_RANGE,
             HeaderValue::from_str(&format!("bytes {start}-{end}/{full_len}"))
                 .expect("generated range"),
         );
-        self.response.headers_mut().insert(
-            "content-length",
+        self.response.headers_mut().insert(::http::header::CONTENT_LENGTH,
             HeaderValue::from_str(&slice.len().to_string()).expect("generated length"),
         );
         self.body = slice;