docs: add documentation comments for request module and inline perfor…

…mance annotations

crates/web/src/request.rs

@@ -1,54 +1,80 @@
+//! Request handling module that provides access to HTTP request information and path parameters.
+//! 
+//! This module contains the core types for working with HTTP requests in the web framework:
+//! - `RequestContext`: Provides access to request headers and path parameters
+//! - `PathParams`: Handles URL path parameters extracted from request paths
+
 use http::{HeaderMap, Method, Uri, Version};
 use matchit::Params;
 use micro_http::protocol::RequestHeader;
 
+/// Represents the context of an HTTP request, providing access to both the request headers
+/// and any path parameters extracted from the URL.
+///
+/// The lifetime parameters ensure that the request context does not outlive the server
+/// or the request data it references.
 pub struct RequestContext<'server: 'req, 'req> {
     request_header: &'req RequestHeader,
     path_params: PathParams<'server, 'req>,
 }
 
 impl<'server, 'req> RequestContext<'server, 'req> {
+    /// Creates a new RequestContext with the given request header and path parameters
     pub fn new(request_header: &'req RequestHeader, path_params: PathParams<'server, 'req>) -> Self {
         Self { request_header, path_params }
     }
 
+    /// Returns a reference to the underlying RequestHeader
     pub fn request_header(&self) -> &RequestHeader {
         self.request_header
     }
 
+    /// Returns the HTTP method of the request
     pub fn method(&self) -> &Method {
         self.request_header.method()
     }
 
+    /// Returns the URI of the request
     pub fn uri(&self) -> &Uri {
         self.request_header.uri()
     }
 
+    /// Returns the HTTP version of the request
     pub fn version(&self) -> Version {
         self.request_header.version()
     }
 
+    /// Returns the HTTP headers of the request
     pub fn headers(&self) -> &HeaderMap {
         self.request_header.headers()
     }
 
+    /// Returns a reference to the path parameters extracted from the request URL
     pub fn path_params(&self) -> &PathParams {
         &self.path_params
     }
 }
 
+/// Represents path parameters extracted from the URL path of an HTTP request.
+/// 
+/// Path parameters are named segments in the URL path that can be extracted and accessed
+/// by name. For example, in the path "/users/{id}", "id" is a path parameter.
 #[derive(Debug, Clone)]
 pub struct PathParams<'server, 'req> {
     kind: PathParamsKind<'server, 'req>,
 }
 
+/// Internal enum to represent either empty parameters or actual parameters
 #[derive(Debug, Clone)]
 enum PathParamsKind<'server, 'req> {
     None,
     Params(Params<'server, 'req>),
 }
 
 impl<'server, 'req> PathParams<'server, 'req> {
+    /// Creates a new PathParams instance from the given Params
+    /// If the params are empty, returns an empty PathParams instance
+    #[inline]
     fn new(params: Params<'server, 'req>) -> Self {
         if params.is_empty() {
             Self::empty()
@@ -57,24 +83,33 @@ impl<'server, 'req> PathParams<'server, 'req> {
         }
     }
 
+    /// Creates an empty PathParams instance with no parameters
+    #[inline]
     pub fn empty() -> Self {
         Self { kind: PathParamsKind::None }
     }
 
+    /// Returns true if there are no path parameters
+    #[inline]
     pub fn is_empty(&self) -> bool {
         match &self.kind {
             PathParamsKind::None => true,
             PathParamsKind::Params(params) => params.is_empty(),
         }
     }
 
+    /// Returns the number of path parameters
+    #[inline]
     pub fn len(&self) -> usize {
         match &self.kind {
             PathParamsKind::None => 0,
             PathParamsKind::Params(params) => params.len(),
         }
     }
 
+    /// Gets the value of a path parameter by its name
+    /// Returns None if the parameter doesn't exist
+    #[inline]
     pub fn get(&self, key: impl AsRef<str>) -> Option<&'req str> {
         match &self.kind {
             PathParamsKind::Params(params) => params.get(key),
@@ -83,6 +118,7 @@ impl<'server, 'req> PathParams<'server, 'req> {
     }
 }
 
+// Implementation of From trait to convert from Params to PathParams
 impl<'server, 'req> From<Params<'server, 'req>> for PathParams<'server, 'req> {
     fn from(params: Params<'server, 'req>) -> Self {
         PathParams::new(params)