diff --git a/Cargo.toml b/Cargo.toml
index 80ab5fc..a954d4b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,6 +22,7 @@ derive_more = { version = "1.0", features = [
 http = "1.1"
 path-clean = "1.0"
 reqwest = "0.12"
+url = "2.5"
 tempfile = "3.10"
 
 [dev-dependencies]
diff --git a/examples/get.rs b/examples/get.rs
index 337b53b..96edaea 100644
--- a/examples/get.rs
+++ b/examples/get.rs
@@ -114,14 +114,11 @@ mod tests {
         let url = "http://localhost:8080";
 
         // declare what response should be made for a given request
-        let response = mock_net.response().body("contents");
-        let request = mock_net.client().get(url);
+        let response = mock_net.response().body("contents").expect("response body");
         mock_net
-            .on(request)
-            // By default, the METHOD and URL must match, equivalent to:
-            //.match_on(vec![MatchOn::Method, MatchOn::Url])
-            .respond_with_body(response)
-            .expect("mock");
+            .on(http::Method::GET)
+            .url(url::Url::parse(url).expect("parse url"))
+            .respond(response);
 
         // Create a temporary directory that will be deleted with `fs` goes out of scope
         let fs = kxio::fs::temp().expect("temp fs");
@@ -146,7 +143,7 @@ mod tests {
 
         // not needed for this test, but should it be needed, we can avoid checking for any
         // unconsumed request matches.
-        let mock_net = kxio::net::MockNet::try_from(net).expect("recover mock");
-        mock_net.reset();
+        // let mock_net = kxio::net::MockNet::try_from(net).expect("recover mock");
+        // mock_net.reset();
     }
 }
diff --git a/src/net/mod.rs b/src/net/mod.rs
index 2970da6..8ee38b0 100644
--- a/src/net/mod.rs
+++ b/src/net/mod.rs
@@ -82,19 +82,12 @@
 //! # #[tokio::main]
 //! # async fn main() -> net::Result<()> {
 //! # let mock_net = net::mock();
-//! # let client = mock_net.client();
-//! mock_net.on(client.get("https://example.com"))
-//!     .match_on(vec![
-//!         MatchOn::Url,
-//!         MatchOn::Method
-//!     ])
-//!     .respond(mock_net.response().status(200))?;
-//! mock_net.on(client.get("https://example.com/foo"))
-//!     .match_on(vec![
-//!         MatchOn::Url,
-//!         MatchOn::Method
-//!     ])
-//!     .respond_with_body(mock_net.response().status(500).body("Mocked response"))?;
+//! mock_net.on(http::Method::GET)
+//!     .url(url::Url::parse("https://example.com")?)
+//!     .respond(mock_net.response().status(200).body("")?);
+//! mock_net.on(http::Method::GET)
+//!     .url(url::Url::parse("https://example.com/foo")?)
+//!     .respond(mock_net.response().status(500).body("Mocked response")?);
 //! # mock_net.reset();
 //! # Ok(())
 //! # }
@@ -231,12 +224,9 @@
 //! # async fn main() -> net::Result<()> {
 //! # let mock_net = net::mock();
 //! # let client = mock_net.client();
-//! mock_net.on(client.get("https://example.com"))
-//!     .match_on(vec![
-//!         MatchOn::Url,
-//!         MatchOn::Method
-//!     ])
-//!     .respond_with_body(mock_net.response().status(200).body("Mocked response"))?;
+//! mock_net.on(http::Method::GET)
+//!     .url(url::Url::parse("https://example.com")?)
+//!     .respond(mock_net.response().status(200).body("Mocked response")?);
 //! # mock_net.reset();
 //! # Ok(())
 //! # }
@@ -297,7 +287,7 @@ mod system;
 
 pub use result::{Error, Result};
 
-pub use system::{MatchOn, MockNet, Net, OnRequest};
+pub use system::{MatchOn, MockNet, Net};
 
 /// Creates a new `Net`.
 pub const fn new() -> Net {
diff --git a/src/net/result.rs b/src/net/result.rs
index 0742be6..eb4d962 100644
--- a/src/net/result.rs
+++ b/src/net/result.rs
@@ -16,6 +16,8 @@ pub enum Error {
     /// The cause has been converted to a String.
     Request(String),
 
+    Url(url::ParseError),
+
     /// There was network request that doesn't match any that were expected
     #[display("Unexpected request: {0}", 0.to_string())]
     UnexpectedMockRequest(reqwest::Request),
diff --git a/src/net/system.rs b/src/net/system.rs
index 6c31bda..f81337d 100644
--- a/src/net/system.rs
+++ b/src/net/system.rs
@@ -1,7 +1,7 @@
 //
 use std::cell::RefCell;
 
-use reqwest::Client;
+use reqwest::{Body, Client};
 
 use super::{Error, Result};
 
@@ -27,11 +27,31 @@ pub enum MatchOn {
 /// A planned request and the response to return
 ///
 /// Contains a list of the criteria that a request must meet before being considered a match.
-#[derive(Debug)]
 struct Plan {
-    request: reqwest::Request,
+    match_request: Vec<MatchRequest>,
     response: reqwest::Response,
-    match_on: Vec<MatchOn>,
+}
+impl Plan {
+    fn matches(&self, request: &reqwest::Request) -> bool {
+        self.match_request.iter().all(|criteria| match criteria {
+            MatchRequest::Method(method) => request.method() == method,
+            MatchRequest::Url(uri) => request.url() == uri,
+            MatchRequest::Header { name, value } => {
+                request
+                    .headers()
+                    .iter()
+                    .any(|(request_header_name, request_header_value)| {
+                        let Ok(request_header_value) = request_header_value.to_str() else {
+                            return false;
+                        };
+                        request_header_name.as_str() == name && request_header_value == value
+                    })
+            }
+            MatchRequest::Body(body) => {
+                request.body().and_then(Body::as_bytes) == Some(body.as_bytes())
+            }
+        })
+    }
 }
 
 /// An abstraction for the network
@@ -93,36 +113,10 @@ impl Net {
             return request.into().send().await.map_err(Error::from);
         };
         let request = request.into().build()?;
-        let index = plans.borrow().iter().position(|plan| {
-            // METHOD
-            (if plan.match_on.contains(&MatchOn::Method) {
-                plan.request.method() == request.method()
-            } else {
-                true
-            })
-            // URL
-            && (if plan.match_on.contains(&MatchOn::Url) {
-                plan.request.url() == request.url()
-            } else {
-                true
-            })
-            // BODY
-            && (if plan.match_on.contains(&MatchOn::Body) {
-                match (plan.request.body(), request.body()) {
-                    (None, None) => true,
-                    (Some(plan), Some(req)) => plan.as_bytes().eq(&req.as_bytes()),
-                    _ => false,
-                }
-            } else {
-                true
-            })
-            // HEADERS
-            && (if plan.match_on.contains(&MatchOn::Headers) {
-                plan.request.headers() == request.headers()
-            } else {
-                true
-            })
-        });
+        let index = plans
+            .borrow()
+            .iter()
+            .position(|plan| plan.matches(&request));
         match index {
             Some(i) => {
                 let response = plans.borrow_mut().remove(i).response;
@@ -159,8 +153,9 @@ impl TryFrom<Net> for MockNet {
 /// let mock_net = kxio::net::mock();
 /// let client = mock_net.client();
 /// // define an expected requet, and the response that should be returned
-/// mock_net.on(client.get("https://hyper.rs"))
-///     .respond_with_body(mock_net.response().status(200).body("Ok"))?;
+/// mock_net.on(http::Method::GET)
+///     .url(url::Url::parse("https://hyper.rs")?)
+///     .respond(mock_net.response().status(200).body("Ok")?);
 /// let net: kxio::net::Net = mock_net.into();
 /// // use 'net' in your program, by passing it as a reference
 ///
@@ -197,34 +192,18 @@ impl MockNet {
     /// # fn run() -> Result<()> {
     /// let mock_net = kxio::net::mock();
     /// let client = mock_net.client();
-    /// mock_net.on(client.get("https://hyper.rs"))
-    ///     .respond_with_body(mock_net.response().status(200).body("Ok"))?;
+    /// mock_net.on(http::Method::GET)
+    ///     .url(url::Url::parse("https://hyper.rs")?)
+    ///     .respond(mock_net.response().status(200).body("Ok")?);
     /// # Ok(())
     /// # }
     /// ```
-    pub fn on(&self, request_builder: impl Into<reqwest::RequestBuilder>) -> OnRequest {
-        match request_builder.into().build() {
-            Ok(request) => OnRequest::Valid {
-                net: self,
-                request,
-                match_on: vec![MatchOn::Method, MatchOn::Url],
-            },
-            Err(err) => OnRequest::Error(err.into()),
-        }
+    pub fn on(&self, method: impl Into<http::Method>) -> WhenRequest {
+        WhenRequest::new(self, method)
     }
 
-    fn _on(
-        &self,
-        request: reqwest::Request,
-        response: reqwest::Response,
-        match_on: Vec<MatchOn>,
-    ) -> Result<()> {
-        self.plans.borrow_mut().push(Plan {
-            request,
-            response,
-            match_on,
-        });
-        Ok(())
+    fn _when(&self, plan: Plan) {
+        self.plans.borrow_mut().push(plan);
     }
 
     /// Creates a [http::response::Builder] to be extended and returned by a mocked network request.
@@ -276,77 +255,48 @@ impl Drop for Net {
     }
 }
 
-/// Intermediate struct used while declaring an expected request and its response.
-pub enum OnRequest<'net> {
-    Valid {
-        net: &'net MockNet,
-        request: reqwest::Request,
-        match_on: Vec<MatchOn>,
-    },
-    Error(super::Error),
+pub enum MatchRequest {
+    Method(http::Method),
+    Url(reqwest::Url),
+    Header { name: String, value: String },
+    Body(String),
 }
-impl<'net> OnRequest<'net> {
-    /// Specify the criteria that a request should be compared against.
-    ///
-    /// Given an candidate request, it will be matched against the current request if it has the
-    /// same HTTP Method and Url by default. i.e. if this method is not called.
-    ///
-    /// All criteria must be met for the match to be made.
-    ///
-    /// Calling this method replaces the default criteria with the new criteria.
-    pub fn match_on(self, match_on: Vec<MatchOn>) -> Self {
-        if let OnRequest::Valid {
-            net,
-            request,
-            match_on: _,
-        } = self
-        {
-            Self::Valid {
-                net,
-                request,
-                match_on,
-            }
-        } else {
-            self
-        }
-    }
 
-    /// Constructs the response to be returned when a request matched the criteria.
-    ///
-    /// The response will have an empty HTTP Body.
-    ///
-    /// Each request and response pair can only be matched once each.
-    pub fn respond(self, response: impl Into<http::response::Builder>) -> Result<()> {
-        match self {
-            OnRequest::Valid {
-                net: _,
-                request: _,
-                match_on: _,
-            } => self.respond_with_body(response.into().body("")),
-            OnRequest::Error(error) => Err(error),
-        }
-    }
+pub struct WhenRequest<'net> {
+    net: &'net MockNet,
+    match_on: Vec<MatchRequest>,
+}
 
-    /// Constructs the response to be returned when a request matched the criteria.
-    ///
-    /// Each request and response pair can only be matched once each.
-    pub fn respond_with_body<T>(
-        self,
-        body_result: std::result::Result<http::Response<T>, http::Error>,
-    ) -> Result<()>
+impl<'net> WhenRequest<'net> {
+    pub fn url(mut self, url: impl Into<reqwest::Url>) -> Self {
+        self.match_on.push(MatchRequest::Url(url.into()));
+        self
+    }
+    pub fn header(mut self, name: impl Into<String>, value: impl Into<String>) -> Self {
+        self.match_on.push(MatchRequest::Header {
+            name: name.into(),
+            value: value.into(),
+        });
+        self
+    }
+    pub fn body(mut self, body: impl Into<String>) -> Self {
+        self.match_on.push(MatchRequest::Body(body.into()));
+        self
+    }
+    pub fn respond<T>(self, response: http::Response<T>)
     where
         T: Into<reqwest::Body>,
     {
-        match body_result {
-            Ok(response) => match self {
-                OnRequest::Valid {
-                    net,
-                    request,
-                    match_on,
-                } => net._on(request, response.into(), match_on),
-                OnRequest::Error(error) => Err(error),
-            },
-            Err(err) => Err(err.into()),
+        self.net._when(Plan {
+            match_request: self.match_on,
+            response: response.into(),
+        });
+    }
+
+    fn new(net: &'net MockNet, method: impl Into<http::Method>) -> Self {
+        Self {
+            net,
+            match_on: vec![MatchRequest::Method(method.into())],
         }
     }
 }
diff --git a/tests/net.rs b/tests/net.rs
index d297225..6a5e010 100644
--- a/tests/net.rs
+++ b/tests/net.rs
@@ -1,23 +1,29 @@
 use assert2::let_assert;
+use http::Method;
 //
-use kxio::net::{Error, MatchOn, MockNet, Net};
+use kxio::net::{Error, MockNet, Net};
+use reqwest::Url;
 
 #[tokio::test]
 async fn test_get_url() {
     //given
-    let net = kxio::net::mock();
-    let client = net.client();
+    let mock_net = kxio::net::mock();
+    let client = mock_net.client();
 
     let url = "https://www.example.com";
-    let request = client.get(url);
-    let my_response = net.response().status(200).body("Get OK");
+    let my_response = mock_net
+        .response()
+        .status(200)
+        .body("Get OK")
+        .expect("body");
 
-    net.on(request)
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+    mock_net
+        .on(Method::GET)
+        .url(Url::parse(url).expect("parse url"))
+        .respond(my_response);
 
     //when
-    let response = Net::from(net)
+    let response = Net::from(mock_net)
         .send(client.get(url))
         .await
         .expect("response");
@@ -34,13 +40,16 @@ async fn test_get_wrong_url() {
     let client = mock_net.client();
 
     let url = "https://www.example.com";
-    let request = client.get(url);
-    let my_response = mock_net.response().status(200).body("Get OK");
+    let my_response = mock_net
+        .response()
+        .status(200)
+        .body("Get OK")
+        .expect("body");
 
     mock_net
-        .on(request)
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+        .on(Method::GET)
+        .url(Url::parse(url).expect("parse url"))
+        .respond(my_response);
 
     let net = Net::from(mock_net);
 
@@ -65,12 +74,11 @@ async fn test_post_url() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url);
-    let my_response = net.response().status(200).body("Post OK");
+    let my_response = net.response().status(200).body("Post OK").expect("body");
 
-    net.on(request)
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+    net.on(Method::POST)
+        .url(Url::parse(url).expect("parse url"))
+        .respond(my_response);
 
     //when
     let response = Net::from(net)
@@ -89,20 +97,13 @@ async fn test_post_by_method() {
     let net = kxio::net::mock();
     let client = net.client();
 
-    let url = "https://www.example.com";
-    let request = client.post(url);
-    let my_response = net.response().status(200);
+    let my_response = net.response().status(200).body("").expect("response body");
 
-    net.on(request)
-        .match_on(vec![
-            MatchOn::Method,
-            // MatchOn::Url
-        ])
-        .respond(my_response)
-        .expect("on request, respond");
+    net.on(Method::POST)
+        // NOTE: No URL specified - so shou∂ match any URL
+        .respond(my_response);
 
     //when
-    // This request is a different url - but should still match
     let response = Net::from(net)
         .send(client.post("https://some.other.url"))
         .await
@@ -113,59 +114,26 @@ async fn test_post_by_method() {
     assert_eq!(response.bytes().await.expect("response body"), "");
 }
 
-#[tokio::test]
-async fn test_post_by_url() {
-    //given
-    let net = kxio::net::mock();
-    let client = net.client();
-
-    let url = "https://www.example.com";
-    let request = client.post(url);
-    let my_response = net.response().status(200).body("Post OK");
-
-    net.on(request)
-        .match_on(vec![
-            // MatchOn::Method,
-            MatchOn::Url,
-        ])
-        .respond_with_body(my_response)
-        .expect("on request, respond");
-
-    //when
-    // This request is a GET, not POST - but should still match
-    let response = Net::from(net)
-        .send(client.get(url))
-        .await
-        .expect("response");
-
-    //then
-    assert_eq!(response.status(), http::StatusCode::OK);
-    assert_eq!(response.bytes().await.expect("response body"), "Post OK");
-}
-
 #[tokio::test]
 async fn test_post_by_body() {
     //given
     let net = kxio::net::mock();
     let client = net.client();
 
-    let url = "https://www.example.com";
-    let request = client.post(url).body("match on body");
-    let my_response = net.response().status(200).body("response body");
+    let my_response = net
+        .response()
+        .status(200)
+        .body("response body")
+        .expect("body");
 
-    net.on(request)
-        .match_on(vec![
-            // MatchOn::Method,
-            // MatchOn::Url
-            MatchOn::Body,
-        ])
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+    net.on(Method::POST)
+        // No URL - so any POST with a matching body
+        .body("match on body")
+        .respond(my_response);
 
     //when
-    // This request is a GET, not POST - but should still match
     let response = Net::from(net)
-        .send(client.get("https://some.other.url").body("match on body"))
+        .send(client.post("https://some.other.url").body("match on body"))
         .await
         .expect("response");
 
@@ -178,31 +146,27 @@ async fn test_post_by_body() {
 }
 
 #[tokio::test]
-async fn test_post_by_headers() {
+async fn test_post_by_header() {
     //given
     let net = kxio::net::mock();
     let client = net.client();
 
-    let url = "https://www.example.com";
-    let request = client.post(url).body("foo").header("test", "match");
-    let my_response = net.response().status(200).body("response body");
+    let my_response = net
+        .response()
+        .status(200)
+        .body("response body")
+        .expect("body");
 
-    net.on(request)
-        .match_on(vec![
-            // MatchOn::Method,
-            // MatchOn::Url
-            MatchOn::Headers,
-        ])
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+    net.on(Method::POST)
+        .header("test", "match")
+        .respond(my_response);
 
     //when
-    // This request is a GET, not POST - but should still match
     let response = Net::from(net)
         .send(
             client
-                .get("https://some.other.url")
-                .body("match on body")
+                .post("https://some.other.url")
+                .body("nay body")
                 .header("test", "match"),
         )
         .await
@@ -217,20 +181,56 @@ async fn test_post_by_headers() {
 }
 
 #[tokio::test]
-#[should_panic]
-async fn test_unused_post_as_net() {
+async fn test_post_by_header_wrong_value() {
     //given
     let mock_net = kxio::net::mock();
     let client = mock_net.client();
 
-    let url = "https://www.example.com";
-    let request = client.post(url);
-    let my_response = mock_net.response().status(200).body("Post OK");
+    let my_response = mock_net
+        .response()
+        .status(200)
+        .body("response body")
+        .expect("body");
 
     mock_net
-        .on(request)
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+        .on(Method::POST)
+        .header("test", "match")
+        .respond(my_response);
+    let net = Net::from(mock_net);
+
+    //when
+    let response = net
+        .send(
+            client
+                .post("https://some.other.url")
+                .body("nay body")
+                .header("test", "no match"),
+        )
+        .await;
+
+    //then
+    let_assert!(Err(kxio::net::Error::UnexpectedMockRequest(_)) = response);
+
+    MockNet::try_from(net).expect("recover mock").reset();
+}
+
+#[tokio::test]
+#[should_panic]
+async fn test_unused_post_as_net() {
+    //given
+    let mock_net = kxio::net::mock();
+
+    let url = "https://www.example.com";
+    let my_response = mock_net
+        .response()
+        .status(200)
+        .body("Post OK")
+        .expect("body");
+
+    mock_net
+        .on(Method::POST)
+        .url(Url::parse(url).expect("prase url"))
+        .respond(my_response);
 
     let _net = Net::from(mock_net);
 
@@ -247,16 +247,18 @@ async fn test_unused_post_as_net() {
 async fn test_unused_post_as_mocknet() {
     //given
     let mock_net = kxio::net::mock();
-    let client = mock_net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url);
-    let my_response = mock_net.response().status(200).body("Post OK");
+    let my_response = mock_net
+        .response()
+        .status(200)
+        .body("Post OK")
+        .expect("body");
 
     mock_net
-        .on(request)
-        .respond_with_body(my_response)
-        .expect("on request, respond");
+        .on(Method::POST)
+        .url(Url::parse(url).expect("parse url"))
+        .respond(my_response);
 
     //when
     // don't send the planned request