diff --git a/matrix_sdk/src/client.rs b/matrix_sdk/src/client.rs
index 74f47a2f..3a8494eb 100644
--- a/matrix_sdk/src/client.rs
+++ b/matrix_sdk/src/client.rs
@@ -47,15 +47,14 @@ use url::Url;
 
 use crate::{
     events::{room::message::MessageEventContent, EventType},
+    http_client::DefaultHttpClient,
     identifiers::{EventId, RoomId, RoomIdOrAliasId, UserId},
-    Endpoint,
+    Endpoint, HttpSend,
 };
 
 #[cfg(feature = "encryption")]
 use crate::{identifiers::DeviceId, sas::Sas};
 
-#[cfg(not(target_arch = "wasm32"))]
-use crate::VERSION;
 use crate::{api, http_client::HttpClient, EventEmitter, Result};
 use matrix_sdk_base::{BaseClient, BaseClientConfig, Room, Session, StateStore};
 
@@ -108,11 +107,12 @@ impl Debug for Client {
 #[derive(Default)]
 pub struct ClientConfig {
     #[cfg(not(target_arch = "wasm32"))]
-    proxy: Option<reqwest::Proxy>,
-    user_agent: Option<HeaderValue>,
-    disable_ssl_verification: bool,
-    base_config: BaseClientConfig,
-    timeout: Option<Duration>,
+    pub(crate) proxy: Option<reqwest::Proxy>,
+    pub(crate) user_agent: Option<HeaderValue>,
+    pub(crate) disable_ssl_verification: bool,
+    pub(crate) base_config: BaseClientConfig,
+    pub(crate) timeout: Option<Duration>,
+    pub(crate) client: Option<Arc<dyn HttpSend>>,
 }
 
 // #[cfg_attr(tarpaulin, skip)]
@@ -212,6 +212,15 @@ impl ClientConfig {
         self.timeout = Some(timeout);
         self
     }
+
+    /// Specify a client to handle sending requests and receiving responses.
+    ///
+    /// Any type that implements the `HttpSend` trait can be used to send/receive
+    /// `http` types.
+    pub fn client(mut self, client: Arc<dyn HttpSend>) -> Self {
+        self.client = Some(client);
+        self
+    }
 }
 
 #[derive(Debug, Default, Clone)]
@@ -322,48 +331,21 @@ impl Client {
         config: ClientConfig,
     ) -> Result<Self> {
         let homeserver = if let Ok(u) = homeserver_url.try_into() {
-            u
+            Arc::new(u)
         } else {
             panic!("Error parsing homeserver url")
         };
 
-        let http_client = reqwest::Client::builder();
-
-        #[cfg(not(target_arch = "wasm32"))]
-        let http_client = {
-            let http_client = match config.timeout {
-                Some(x) => http_client.timeout(x),
-                None => http_client,
-            };
-
-            let http_client = if config.disable_ssl_verification {
-                http_client.danger_accept_invalid_certs(true)
-            } else {
-                http_client
-            };
-
-            let http_client = match config.proxy {
-                Some(p) => http_client.proxy(p),
-                None => http_client,
-            };
-
-            let mut headers = reqwest::header::HeaderMap::new();
-
-            let user_agent = match config.user_agent {
-                Some(a) => a,
-                None => HeaderValue::from_str(&format!("matrix-rust-sdk {}", VERSION)).unwrap(),
-            };
-
-            headers.insert(reqwest::header::USER_AGENT, user_agent);
-
-            http_client.default_headers(headers)
-        };
-
-        let homeserver = Arc::new(homeserver);
-
-        let http_client = HttpClient {
-            homeserver: homeserver.clone(),
-            inner: http_client.build()?,
+        let http_client = if let Some(client) = config.client {
+            HttpClient {
+                homeserver: homeserver.clone(),
+                inner: client,
+            }
+        } else {
+            HttpClient {
+                homeserver: homeserver.clone(),
+                inner: Arc::new(DefaultHttpClient::with_config(&config)?),
+            }
         };
 
         let base_client = BaseClient::new_with_config(config.base_config)?;
diff --git a/matrix_sdk/src/http_client.rs b/matrix_sdk/src/http_client.rs
index 3e2367a1..000e8e36 100644
--- a/matrix_sdk/src/http_client.rs
+++ b/matrix_sdk/src/http_client.rs
@@ -12,10 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-use std::{
-    convert::{TryFrom, TryInto},
-    sync::Arc,
-};
+use std::{convert::TryFrom, sync::Arc};
 
 use http::{HeaderValue, Method as HttpMethod, Response as HttpResponse};
 use reqwest::{Client, Response};
@@ -24,11 +21,11 @@ use url::Url;
 
 use matrix_sdk_common::{locks::RwLock, FromHttpResponseError};
 
-use crate::{Endpoint, Error, Result, Session};
+use crate::{ClientConfig, Endpoint, Error, HttpSend, Result, Session};
 
 #[derive(Clone, Debug)]
 pub(crate) struct HttpClient {
-    pub(crate) inner: Client,
+    pub(crate) inner: Arc<dyn HttpSend>,
     pub(crate) homeserver: Arc<Url>,
 }
 
@@ -62,7 +59,7 @@ impl HttpClient {
             );
         }
 
-        Ok(self.inner.execute(request.try_into()?).await?)
+        self.inner.send_request(request).await
     }
 
     async fn response_to_http_response(
@@ -100,3 +97,62 @@ impl HttpClient {
         Ok(Request::IncomingResponse::try_from(response)?)
     }
 }
+
+/// Default http client used if none is specified using `Client::with_client`.
+#[derive(Clone, Debug)]
+pub struct DefaultHttpClient {
+    inner: Client,
+}
+
+impl DefaultHttpClient {
+    /// Build a client with the specified configuration.
+    pub fn with_config(config: &ClientConfig) -> Result<Self> {
+        let http_client = reqwest::Client::builder();
+
+        #[cfg(not(target_arch = "wasm32"))]
+        let http_client = {
+            let http_client = match config.timeout {
+                Some(x) => http_client.timeout(x),
+                None => http_client,
+            };
+
+            let http_client = if config.disable_ssl_verification {
+                http_client.danger_accept_invalid_certs(true)
+            } else {
+                http_client
+            };
+
+            let http_client = match &config.proxy {
+                Some(p) => http_client.proxy(p.clone()),
+                None => http_client,
+            };
+
+            let mut headers = reqwest::header::HeaderMap::new();
+
+            let user_agent = match &config.user_agent {
+                Some(a) => a.clone(),
+                None => {
+                    HeaderValue::from_str(&format!("matrix-rust-sdk {}", crate::VERSION)).unwrap()
+                }
+            };
+
+            headers.insert(reqwest::header::USER_AGENT, user_agent);
+
+            http_client.default_headers(headers)
+        };
+
+        Ok(Self {
+            inner: http_client.build()?,
+        })
+    }
+}
+
+#[async_trait::async_trait]
+impl HttpSend for DefaultHttpClient {
+    async fn send_request(&self, request: http::Request<Vec<u8>>) -> Result<Response> {
+        Ok(self
+            .inner
+            .execute(reqwest::Request::try_from(request)?)
+            .await?)
+    }
+}