diff --git a/examples/get.rs b/examples/get.rs
index f97cc29..5d91e88 100644
--- a/examples/get.rs
+++ b/examples/get.rs
@@ -114,14 +114,13 @@ mod tests {
         let url = "http://localhost:8080";
 
         // declare what response should be made for a given request
-        let response: http::Response<&str> =
-            mock_net.response().body("contents").expect("response body");
-        let request = mock_net.client().get(url).build().expect("request");
+        let response = mock_net.response().body("contents");
+        let request = mock_net.client().get(url);
         mock_net
             .on(request)
             // By default, the METHOD and URL must match, equivalent to:
             //.match_on(vec![MatchOn::Method, MatchOn::Url])
-            .respond(response)
+            .respond_with_body(response)
             .expect("mock");
 
         // Create a temporary directory that will be deleted with `fs` goes out of scope
diff --git a/justfile b/justfile
index 9ee25d7..e4b45f5 100644
--- a/justfile
+++ b/justfile
@@ -10,6 +10,12 @@ build:
   cargo test --example get
   cargo mutants --jobs 4
 
+doc-test:
+  cargo doc
+  cargo test
+  cargo test --example get
+
+
 install-hooks:
   @echo "Installing git hooks"
   git config core.hooksPath .git-hooks
diff --git a/src/net/mod.rs b/src/net/mod.rs
index 89691a5..1161184 100644
--- a/src/net/mod.rs
+++ b/src/net/mod.rs
@@ -1,13 +1,161 @@
 //! Provides a generic interface for network operations.
 //!
 //!
+//! Provides a testable interface over the [reqwest] crate.
+//!
+//! ## Overview
+//!
+//! The `net` module provides a testable interface for network operations.
+//! It includes implementations for both real network interactions and mocked network operations for testing purposes.
+//!
+//! ## Key methods and types:
+//!
+//! - [kxio::net::new()][new()]: Creates a new `Net` instance
+//! - [kxio::net::mock()][mock()]: Creates a new `MockNet` instance for use in tests
+//! - [Error]: enum for network-related errors
+//! - [Result]: an alias for `core::result::Result<T, Error>`
+//! - [Net]: struct for real and mocked network operations
+//! - [MockNet]: struct for defining behaviours of mocked network operations
+//!
+//! ## Usage
+//!
+//! Write your program to take a reference to [Net].
+//!
+//! Use the [Net::client] functionto create a [reqwest::RequestBuilder] which you should then pass to the [Net::send] method.
+//! This is rather than building the request and calling its own `send` method, doing so would result in the network request being sent, even under-test.
+//!
+//! ```rust
+//! use kxio::net;
+//! async fn get_example(net: &net::Net) -> net::Result<()> {
+//!     let response = net.send(net.client().get("https://example.com")).await?;
+//!     ///...
+//!     Ok(())
+//! }
+//! ```
+//!
+//! ### Real Network Operations
+//!
+//! In your production code you will want to make real network requests.
+//!
+//! Construct a [Net] using [kxio::net::new()][new()]. Then pass as a reference to your program.
+//!
+//! ```rust
+//! use kxio::net;
+//! # #[tokio::main]
+//! # async fn main() -> net::Result<()> {
+//! let net = net::new();
+//!
+//! get_example(&net).await?;
+//! # Ok(())
+//! # }
+//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
+//! ```
+//!
+//! ### Mocked Network Operations
+//!
+//! In your tests you will want to mock your network requests and responses.
+//!
+//! Construct a [MockNet] using [kxio::net::mock()][mock()].
+//!
+//! ```rust
+//! use kxio::net;
+//! let mock_net = net::mock();
+//! ```
+//!
+//! Create a [reqwest::Client] using [MockNet::client()].
+//!
+//! ```rust
+//! # let mock_net = kxio::net::mock();
+//! let client = mock_net.client();
+//! // this is the same as:
+//! let client = reqwest::Client::new();
+//! ```
+//!
+//! Define the expected responses for each request, using the [MockNet::on],
+//! that you expect you program to make during the test. You can choose what each request should be
+//! matched against. The default is to the match when both the Method and Url are the same.
+//!
+//! ```rust
+//! use kxio::net;
+//! use kxio::net::MatchOn;
+//!
+//! # #[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.reset();
+//! # Ok(())
+//! # }
+//! ```
+//!
+//! All [MatchOn] options:
+//! - [MatchOn::Method] (default)
+//! - [MatchOn::Url] (default)
+//! - [MatchOn::Headers]
+//! - [MatchOn::Body].
+//!
+//! Once you have defined all your expected responses, convert the [MockNet] into a [Net].
+//!
+//! ```rust
+//! # use kxio::net;
+//! # let mock_net = net::mock();
+//! let net: net::Net = mock_net.into();
+//! // or
+//! # let mock_net = net::mock();
+//! let net = net::Net::from(mock_net);
+//! ```
+//!
+//! Now you can pass a reference to `net` to your program.
+//!
+//! ```rust
+//! # use kxio::net;
+//! # #[tokio::main]
+//! # async fn main() -> net::Result<()> {
+//! # let mock_net = net::mock();
+//! # let net = net::Net::from(mock_net);
+//! get_example(&net).await?;
+//! # Ok(())
+//! # }
+//! # async fn get_example(net: &net::Net) -> net::Result<()> {Ok(())}
+//! ```
+//!
+//! When your test is finished, the [MockNet] will check that all the expected requests were
+//! actually made. If there were any missed, then the test will [panic].
+//!
+//! If you don't want this to happen, then call [MockNet::reset] before your test finishes.
+//! You will need to recover the [MockNet] from the [Net].
+//!
+//! ```rust
+//! # use kxio::net;
+//! # let mock_net = net::mock();
+//! # let net = net::Net::from(mock_net);
+//! let mock_net = kxio::net::MockNet::try_from(net).expect("recover mock");
+//! mock_net.reset();
+//! ````
+//!
+//! ## Error Handling
+//!
+//! The module uses a custom [Result] type that wraps `core::result::Result` with the custom [Error] enum,
+//! allowing for specific error handling related to network operations.
 
 mod result;
 mod system;
 
 pub use result::{Error, Result};
 
-pub use system::{MatchOn, MockNet, Net};
+pub use system::{MatchOn, MockNet, Net, OnRequest};
 
 /// Creates a new `Net`.
 pub const fn new() -> Net {
diff --git a/src/net/system.rs b/src/net/system.rs
index 1ed229e..6374e74 100644
--- a/src/net/system.rs
+++ b/src/net/system.rs
@@ -32,6 +32,7 @@ struct Plan {
     match_on: Vec<MatchOn>,
 }
 
+/// An abstraction for the network
 #[derive(Debug)]
 pub struct Net {
     inner: InnerNet<Unmocked>,
@@ -68,6 +69,14 @@ impl Net {
         }
     }
 }
+impl Default for Net {
+    fn default() -> Self {
+        Self {
+            inner: InnerNet::<Unmocked>::new(),
+            mock: None,
+        }
+    }
+}
 impl TryFrom<Net> for MockNet {
     type Error = super::Error;
 
@@ -87,7 +96,7 @@ impl MockNet {
     pub fn client(&self) -> Client {
         Default::default()
     }
-    pub fn on(&self, request: impl Into<reqwest::Request>) -> OnRequest {
+    pub fn on(&self, request: impl Into<reqwest::RequestBuilder>) -> OnRequest {
         self.inner.on(request)
     }
     /// Creates a [http::response::Builder] to be extended and returned by a mocked network request.
@@ -190,11 +199,14 @@ impl InnerNet<Mocked> {
         }
     }
 
-    pub fn on(&self, request: impl Into<reqwest::Request>) -> OnRequest {
-        OnRequest {
-            net: self,
-            request: request.into(),
-            match_on: vec![MatchOn::Method, MatchOn::Url],
+    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()),
         }
     }
 
@@ -228,20 +240,58 @@ impl<T: NetType> Drop for InnerNet<T> {
     }
 }
 
-pub struct OnRequest<'net> {
-    net: &'net InnerNet<Mocked>,
-    request: reqwest::Request,
-    match_on: Vec<MatchOn>,
+pub enum OnRequest<'net> {
+    Valid {
+        net: &'net InnerNet<Mocked>,
+        request: reqwest::Request,
+        match_on: Vec<MatchOn>,
+    },
+    Error(super::Error),
 }
 impl<'net> OnRequest<'net> {
     pub fn match_on(self, match_on: Vec<MatchOn>) -> Self {
-        Self {
-            net: self.net,
-            request: self.request,
-            match_on,
+        if let OnRequest::Valid {
+            net,
+            request,
+            match_on: _,
+        } = self
+        {
+            Self::Valid {
+                net,
+                request,
+                match_on,
+            }
+        } else {
+            self
         }
     }
-    pub fn respond(self, response: impl Into<reqwest::Response>) -> Result<()> {
-        self.net._on(self.request, response.into(), self.match_on)
+    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 fn respond_with_body<T>(
+        self,
+        body_result: std::result::Result<http::Response<T>, http::Error>,
+    ) -> Result<()>
+    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()),
+        }
     }
 }
diff --git a/tests/net.rs b/tests/net.rs
index 5648463..7e608f8 100644
--- a/tests/net.rs
+++ b/tests/net.rs
@@ -9,15 +9,11 @@ async fn test_get_url() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.get(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Get OK")
-        .expect("request body");
+    let request = client.get(url);
+    let my_response = net.response().status(200).body("Get OK");
 
     net.on(request)
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -38,15 +34,11 @@ async fn test_get_wrong_url() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.get(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Get OK")
-        .expect("request body");
+    let request = client.get(url);
+    let my_response = net.response().status(200).body("Get OK");
 
     net.on(request)
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -69,15 +61,11 @@ async fn test_post_url() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Post OK")
-        .expect("request body");
+    let request = client.post(url);
+    let my_response = net.response().status(200).body("Post OK");
 
     net.on(request)
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -98,12 +86,8 @@ async fn test_post_by_method() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Post OK")
-        .expect("request body");
+    let request = client.post(url);
+    let my_response = net.response().status(200);
 
     net.on(request)
         .match_on(vec![
@@ -122,7 +106,7 @@ async fn test_post_by_method() {
 
     //then
     assert_eq!(response.status(), http::StatusCode::OK);
-    assert_eq!(response.bytes().await.expect("response body"), "Post OK");
+    assert_eq!(response.bytes().await.expect("response body"), "");
 }
 
 #[tokio::test]
@@ -132,19 +116,15 @@ async fn test_post_by_url() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Post OK")
-        .expect("request body");
+    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(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -166,16 +146,8 @@ async fn test_post_by_body() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client
-        .post(url)
-        .body("match on body")
-        .build()
-        .expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("response body")
-        .expect("request body");
+    let request = client.post(url).body("match on body");
+    let my_response = net.response().status(200).body("response body");
 
     net.on(request)
         .match_on(vec![
@@ -183,7 +155,7 @@ async fn test_post_by_body() {
             // MatchOn::Url
             MatchOn::Body,
         ])
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -208,17 +180,8 @@ async fn test_post_by_headers() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client
-        .post(url)
-        .body("foo")
-        .header("test", "match")
-        .build()
-        .expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("response body")
-        .expect("request body");
+    let request = client.post(url).body("foo").header("test", "match");
+    let my_response = net.response().status(200).body("response body");
 
     net.on(request)
         .match_on(vec![
@@ -226,7 +189,7 @@ async fn test_post_by_headers() {
             // MatchOn::Url
             MatchOn::Headers,
         ])
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when
@@ -257,15 +220,11 @@ async fn test_unused_post() {
     let client = net.client();
 
     let url = "https://www.example.com";
-    let request = client.post(url).build().expect("build request");
-    let my_response = net
-        .response()
-        .status(200)
-        .body("Post OK")
-        .expect("request body");
+    let request = client.post(url);
+    let my_response = net.response().status(200).body("Post OK");
 
     net.on(request)
-        .respond(my_response)
+        .respond_with_body(my_response)
         .expect("on request, respond");
 
     //when