diff --git a/src/client.rs b/src/client.rs
index c34d664..3158ff2 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -1,10 +1,41 @@
-pub mod connection;
 pub mod error;
 pub mod response;
 pub mod socket;
 
 pub use error::Error;
+
 pub use response::Response;
 pub use socket::Socket;
 
-// @TODO
+use gio::Cancellable;
+use glib::{Priority, Uri};
+
+/// High-level API to make async request, get `Response` and close connection.
+pub fn request_async(
+    uri: Uri,
+    cancelable: Option<Cancellable>,
+    priority: Option<Priority>,
+    callback: impl FnOnce(Result<Response, Error>) + 'static,
+) {
+    // Create new socket connection
+    Socket::new().connect_async(
+        uri.clone(),
+        cancelable.clone(),
+        move |connect| match connect {
+            Ok(connection) => {
+                connection.request_async(uri, cancelable, priority, None, |request| {
+                    callback(match request {
+                        Ok(buffer) => match Response::from_utf8(&buffer) {
+                            Ok(response) => Ok(response),
+                            Err(_) => Err(Error::Response),
+                        },
+                        Err(_) => Err(Error::Request),
+                    });
+
+                    //connection.close_async(cancelable, priority, |_| {}); // @TODO
+                })
+            }
+            Err(_) => callback(Err(Error::Connection)),
+        },
+    );
+}
diff --git a/src/client/error.rs b/src/client/error.rs
index 4cf662c..d14b8f1 100644
--- a/src/client/error.rs
+++ b/src/client/error.rs
@@ -1,8 +1,5 @@
 pub enum Error {
-    Close,
-    Connect,
-    Input,
-    Output,
+    Connection,
     Response,
-    BufferOverflow,
+    Request,
 }
diff --git a/src/client/socket.rs b/src/client/socket.rs
index 1f9bf8f..1146cf1 100644
--- a/src/client/socket.rs
+++ b/src/client/socket.rs
@@ -1,23 +1,62 @@
-use gio::{prelude::SocketClientExt, SocketClient, SocketProtocol, TlsCertificateFlags};
+pub mod connection;
+pub mod error;
+
+pub use connection::Connection;
+pub use error::Error;
+
+pub const DEFAULT_PORT: u16 = 1965;
+
+use gio::{
+    prelude::SocketClientExt, Cancellable, SocketClient, SocketProtocol, TlsCertificateFlags,
+};
+use glib::Uri;
 
 pub struct Socket {
-    gobject: SocketClient,
+    client: SocketClient,
 }
 
 impl Socket {
+    // Constructors
+
     /// Create new `gio::SocketClient` preset for Gemini Protocol
     pub fn new() -> Self {
-        let gobject = SocketClient::new();
+        let client = SocketClient::new();
 
-        gobject.set_protocol(SocketProtocol::Tcp);
-        gobject.set_tls_validation_flags(TlsCertificateFlags::INSECURE);
-        gobject.set_tls(true);
+        client.set_protocol(SocketProtocol::Tcp);
+        client.set_tls_validation_flags(TlsCertificateFlags::INSECURE);
+        client.set_tls(true);
 
-        Self { gobject }
+        Self { client }
     }
 
+    // Actions
+    pub fn connect_async(
+        &self,
+        uri: Uri,
+        cancelable: Option<Cancellable>,
+        callback: impl FnOnce(Result<Connection, Error>) + 'static,
+    ) {
+        self.client.connect_to_uri_async(
+            uri.to_str().as_str(),
+            DEFAULT_PORT,
+            match cancelable.clone() {
+                Some(value) => Some(value),
+                None => None::<Cancellable>,
+            }
+            .as_ref(),
+            |result| {
+                callback(match result {
+                    Ok(connection) => Ok(Connection::new_from(connection)),
+                    Err(_) => Err(Error::Connection),
+                })
+            },
+        );
+    }
+
+    // Getters
+
     /// Return ref to `gio::SocketClient` GObject
-    pub fn gobject(&self) -> &SocketClient {
-        self.gobject.as_ref()
+    pub fn client(&self) -> &SocketClient {
+        self.client.as_ref()
     }
 }
diff --git a/src/client/socket/connection.rs b/src/client/socket/connection.rs
new file mode 100644
index 0000000..b9b6e2f
--- /dev/null
+++ b/src/client/socket/connection.rs
@@ -0,0 +1,115 @@
+pub mod error;
+pub mod input;
+pub mod output;
+
+pub use error::Error;
+pub use input::Input;
+pub use output::Output;
+
+use gio::{prelude::IOStreamExt, Cancellable, SocketConnection};
+use glib::{gformat, Bytes, Priority, Uri};
+
+pub struct Connection {
+    connection: SocketConnection,
+}
+
+impl Connection {
+    // Constructors
+
+    pub fn new_from(connection: SocketConnection) -> Self {
+        Self { connection }
+    }
+
+    // Actions
+
+    /// MIddle-level API to make single async socket request for current connection:
+    ///
+    /// 1. send `Uri` request to the ouput stream;
+    /// 2. write entire input stream into the new `Vec<u8>` buffer on success;
+    /// 3. close current connection if callback function does not prevent that action by return.
+    pub fn request_async(
+        self,
+        uri: Uri,
+        cancelable: Option<Cancellable>,
+        priority: Option<Priority>,
+        chunk: Option<usize>,
+        callback: impl FnOnce(Result<Vec<u8>, Error>) + 'static,
+    ) {
+        // Send request
+        Output::new_from_stream(self.connection.output_stream()).write_async(
+            &Bytes::from(gformat!("{}\r\n", uri.to_str()).as_bytes()),
+            cancelable.clone(),
+            priority,
+            move |output| match output {
+                Ok(_) => {
+                    // Read response
+                    Input::new_from_stream(self.connection.input_stream()).read_all_async(
+                        cancelable.clone(),
+                        priority,
+                        chunk,
+                        move |input| {
+                            // Apply callback function
+                            callback(match input {
+                                Ok(buffer) => Ok(buffer.to_utf8()),
+                                Err(error) => Err(match error {
+                                    input::Error::BufferOverflow => Error::InputBufferOverflow,
+                                    input::Error::BufferWrite => Error::InputBufferWrite,
+                                    input::Error::StreamChunkRead => Error::InputStreamChunkRead,
+                                }),
+                            });
+
+                            // Close connection if callback act does not prevent that
+                            self.close_async(cancelable, priority, |_| {}); // @TODO
+                        },
+                    );
+                }
+                Err(error) => {
+                    // Apply callback function
+                    callback(Err(match error {
+                        output::Error::StreamWrite => Error::OutputStreamWrite,
+                    }));
+
+                    // Close connection if callback act does not prevent that
+                    self.close_async(cancelable, priority, |_| {}); // @TODO
+                }
+            },
+        );
+    }
+
+    /// Asynchronously close current connection
+    ///
+    /// Options:
+    /// * `cancellable` https://docs.gtk.org/gio/class.Cancellable.html (`None::<&Cancellable>` by default)
+    /// * `priority` e.g. https://docs.gtk.org/glib/const.PRIORITY_DEFAULT.html (`Priority::DEFAULT` by default)
+    /// * `callback` function to apply on complete
+    pub fn close_async(
+        self,
+        cancelable: Option<Cancellable>,
+        priority: Option<Priority>,
+        callback: impl FnOnce(Result<(), Error>) + 'static,
+    ) {
+        self.connection.close_async(
+            match priority {
+                Some(value) => value,
+                None => Priority::DEFAULT,
+            },
+            match cancelable.clone() {
+                Some(value) => Some(value),
+                None => None::<Cancellable>,
+            }
+            .as_ref(),
+            |result| {
+                callback(match result {
+                    Ok(_) => Ok(()),
+                    Err(_) => Err(Error::Close),
+                })
+            },
+        );
+    }
+
+    // Getters
+
+    pub fn connection(&self) -> &SocketConnection {
+        &self.connection
+    }
+}
diff --git a/src/client/socket/connection/error.rs b/src/client/socket/connection/error.rs
new file mode 100644
index 0000000..7405d6a
--- /dev/null
+++ b/src/client/socket/connection/error.rs
@@ -0,0 +1,7 @@
+pub enum Error {
+    Close,
+    InputBufferOverflow,
+    InputBufferWrite,
+    InputStreamChunkRead,
+    OutputStreamWrite,
+}
diff --git a/src/client/socket/connection/input.rs b/src/client/socket/connection/input.rs
new file mode 100644
index 0000000..16ba332
--- /dev/null
+++ b/src/client/socket/connection/input.rs
@@ -0,0 +1,155 @@
+pub mod buffer;
+pub mod error;
+
+pub use buffer::Buffer;
+pub use error::Error;
+
+use gio::{prelude::InputStreamExt, Cancellable, InputStream};
+use glib::Priority;
+
+pub const DEFAULT_READ_CHUNK: usize = 0x100;
+
+pub struct Input {
+    buffer: Buffer,
+    stream: InputStream,
+}
+
+impl Input {
+    // Constructors
+
+    /// Create new `Input` from `gio::InputStream`
+    ///
+    /// https://docs.gtk.org/gio/class.InputStream.html
+    pub fn new_from_stream(stream: InputStream) -> Self {
+        Self {
+            buffer: Buffer::new(),
+            stream,
+        }
+    }
+
+    // Actions
+
+    /// Synchronously read all bytes from `gio::InputStream` to `input::Buffer`
+    ///
+    /// Options:
+    /// * `cancellable` https://docs.gtk.org/gio/class.Cancellable.html
+    /// * `chunk` max bytes to read per chunk (256 by default)
+    pub fn read_all(
+        mut self,
+        cancelable: Option<Cancellable>,
+        chunk: Option<usize>,
+    ) -> Result<Buffer, Error> {
+        loop {
+            // Continue bytes reading
+            match self.stream.read_bytes(
+                match chunk {
+                    Some(value) => value,
+                    None => DEFAULT_READ_CHUNK,
+                },
+                match cancelable.clone() {
+                    Some(value) => Some(value),
+                    None => None::<Cancellable>,
+                }
+                .as_ref(),
+            ) {
+                Ok(bytes) => {
+                    // No bytes were read, end of stream
+                    if bytes.len() == 0 {
+                        return Ok(self.buffer);
+                    }
+
+                    // Save chunk to buffer
+                    match self.buffer.push(bytes) {
+                        Ok(_) => continue,
+                        Err(buffer::Error::Overflow) => return Err(Error::BufferOverflow),
+                        Err(_) => return Err(Error::BufferWrite),
+                    };
+                }
+                Err(_) => return Err(Error::StreamChunkRead),
+            };
+        }
+    }
+
+    /// Asynchronously read all bytes from `gio::InputStream` to `input::Buffer`,
+    ///
+    /// applies `callback` function on last byte reading complete.
+    ///
+    /// Options:
+    /// * `cancellable` https://docs.gtk.org/gio/class.Cancellable.html (`None::<&Cancellable>` by default)
+    /// * `priority` e.g. https://docs.gtk.org/glib/const.PRIORITY_DEFAULT.html (`Priority::DEFAULT` by default)
+    /// * `chunk` optional max bytes to read per chunk (`DEFAULT_READ_CHUNK` by default)
+    /// * `callback` user function to apply on async iteration complete or `None` to skip
+    pub fn read_all_async(
+        mut self,
+        cancelable: Option<Cancellable>,
+        priority: Option<Priority>,
+        chunk: Option<usize>,
+        callback: impl FnOnce(Result<Buffer, Error>) + 'static,
+    ) {
+        // Continue bytes reading
+        self.stream.clone().read_bytes_async(
+            match chunk {
+                Some(value) => value,
+                None => DEFAULT_READ_CHUNK,
+            },
+            match priority {
+                Some(value) => value,
+                None => Priority::DEFAULT,
+            },
+            match cancelable.clone() {
+                Some(value) => Some(value),
+                None => None::<Cancellable>,
+            }
+            .as_ref(),
+            move |result| {
+                match result {
+                    Ok(bytes) => {
+                        // No bytes were read, end of stream
+                        if bytes.len() == 0 {
+                            return callback(Ok(self.buffer));
+                        }
+
+                        // Save chunk to buffer
+                        match self.buffer.push(bytes) {
+                            Err(buffer::Error::Overflow) => {
+                                return callback(Err(Error::BufferOverflow))
+                            }
+
+                            // Other errors related to write issues @TODO test
+                            Err(_) => return callback(Err(Error::BufferWrite)),
+
+                            // Async function, nothing to return yet
+                            _ => (),
+                        };
+
+                        // Continue bytes reading...
+                        self.read_all_async(cancelable, priority, chunk, callback);
+                    }
+                    Err(_) => callback(Err(Error::StreamChunkRead)),
+                }
+            },
+        );
+    }
+
+    // Setters
+
+    pub fn set_buffer(&mut self, buffer: Buffer) {
+        self.buffer = buffer;
+    }
+
+    pub fn set_stream(&mut self, stream: InputStream) {
+        self.stream = stream;
+    }
+
+    // Getters
+
+    /// Get reference to `Buffer`
+    pub fn buffer(&self) -> &Buffer {
+        &self.buffer
+    }
+
+    /// Get reference to `gio::InputStream`
+    pub fn stream(&self) -> &InputStream {
+        &self.stream
+    }
+}
diff --git a/src/client/socket/connection/input/buffer.rs b/src/client/socket/connection/input/buffer.rs
new file mode 100644
index 0000000..b9264c7
--- /dev/null
+++ b/src/client/socket/connection/input/buffer.rs
@@ -0,0 +1,87 @@
+pub mod error;
+pub use error::Error;
+
+use glib::Bytes;
+
+pub const DEFAULT_CAPACITY: usize = 0x400;
+pub const DEFAULT_MAX_SIZE: usize = 0xfffff;
+
+pub struct Buffer {
+    bytes: Vec<Bytes>,
+    max_size: usize,
+}
+
+impl Buffer {
+    // Constructors
+
+    /// Create new dynamically allocated `Buffer` with default `capacity` and `max_size` limit
+    pub fn new() -> Self {
+        Self::new_with_options(Some(DEFAULT_CAPACITY), Some(DEFAULT_MAX_SIZE))
+    }
+
+    /// Create new dynamically allocated `Buffer` with options
+    ///
+    /// Options:
+    /// * `capacity` initial bytes request to reduce extra memory overwrites (1024 by default)
+    /// * `max_size` max bytes to prevent memory overflow (1M by default)
+    pub fn new_with_options(capacity: Option<usize>, max_size: Option<usize>) -> Self {
+        Self {
+            bytes: Vec::with_capacity(match capacity {
+                Some(value) => value,
+                None => DEFAULT_CAPACITY,
+            }),
+            max_size: match max_size {
+                Some(value) => value,
+                None => DEFAULT_MAX_SIZE,
+            },
+        }
+    }
+
+    // Setters
+
+    /// Set new `Buffer.max_size` value to prevent memory overflow
+    ///
+    /// Use `DEFAULT_MAX_SIZE` if `None` given.
+    pub fn set_max_size(&mut self, value: Option<usize>) {
+        self.max_size = match value {
+            Some(size) => size,
+            None => DEFAULT_MAX_SIZE,
+        }
+    }
+
+    // Actions
+
+    /// Push `glib::Bytes` to `Buffer.bytes`
+    ///
+    /// Return `Error::Overflow` on `Buffer.max_size` reached.
+    pub fn push(&mut self, bytes: Bytes) -> Result<usize, Error> {
+        // Calculate new size value
+        let total = self.bytes.len() + bytes.len();
+
+        // Validate overflow
+        if total > self.max_size {
+            return Err(Error::Overflow);
+        }
+
+        // Success
+        self.bytes.push(bytes);
+
+        Ok(total)
+    }
+
+    // Getters
+
+    /// Get reference to bytes collected
+    pub fn bytes(&self) -> &Vec<Bytes> {
+        &self.bytes
+    }
+
+    /// Return copy of bytes as UTF-8 vector
+    pub fn to_utf8(&self) -> Vec<u8> {
+        self.bytes
+            .iter()
+            .flat_map(|byte| byte.iter())
+            .cloned()
+            .collect()
+    }
+}
diff --git a/src/client/socket/connection/input/buffer/error.rs b/src/client/socket/connection/input/buffer/error.rs
new file mode 100644
index 0000000..68dd893
--- /dev/null
+++ b/src/client/socket/connection/input/buffer/error.rs
@@ -0,0 +1,4 @@
+pub enum Error {
+    Overflow,
+    StreamChunkRead,
+}
diff --git a/src/client/socket/connection/input/error.rs b/src/client/socket/connection/input/error.rs
new file mode 100644
index 0000000..1c383fb
--- /dev/null
+++ b/src/client/socket/connection/input/error.rs
@@ -0,0 +1,5 @@
+pub enum Error {
+    BufferOverflow,
+    BufferWrite,
+    StreamChunkRead,
+}
diff --git a/src/client/socket/connection/output.rs b/src/client/socket/connection/output.rs
new file mode 100644
index 0000000..d6f1821
--- /dev/null
+++ b/src/client/socket/connection/output.rs
@@ -0,0 +1,71 @@
+pub mod error;
+
+pub use error::Error;
+
+use gio::{prelude::OutputStreamExt, Cancellable, OutputStream};
+use glib::{Bytes, Priority};
+
+pub struct Output {
+    stream: OutputStream,
+}
+
+impl Output {
+    // Constructors
+
+    /// Create new `Output` from `gio::OutputStream`
+    ///
+    /// https://docs.gtk.org/gio/class.OutputStream.html
+    pub fn new_from_stream(stream: OutputStream) -> Self {
+        Self { stream }
+    }
+
+    // Actions
+
+    /// Asynchronously write all bytes to `gio::OutputStream`,
+    ///
+    /// applies `callback` function on last byte sent.
+    ///
+    /// Options:
+    /// * `cancellable` https://docs.gtk.org/gio/class.Cancellable.html (`None::<&Cancellable>` by default)
+    /// * `priority` e.g. https://docs.gtk.org/glib/const.PRIORITY_DEFAULT.html (`Priority::DEFAULT` by default)
+    /// * `callback` user function to apply on complete
+    pub fn write_async(
+        &self,
+        bytes: &Bytes,
+        cancelable: Option<Cancellable>,
+        priority: Option<Priority>,
+        callback: impl FnOnce(Result<isize, Error>) + 'static,
+    ) {
+        self.stream.write_bytes_async(
+            bytes,
+            match priority {
+                Some(value) => value,
+                None => Priority::DEFAULT,
+            },
+            match cancelable.clone() {
+                Some(value) => Some(value),
+                None => None::<Cancellable>,
+            }
+            .as_ref(),
+            move |result| {
+                callback(match result {
+                    Ok(size) => Ok(size),
+                    Err(_) => Err(Error::StreamWrite),
+                })
+            },
+        );
+    }
+
+    // Setters
+
+    pub fn set_stream(&mut self, stream: OutputStream) {
+        self.stream = stream;
+    }
+
+    // Getters
+
+    /// Get reference to `gio::OutputStream`
+    pub fn stream(&self) -> &OutputStream {
+        &self.stream
+    }
+}
diff --git a/src/client/socket/connection/output/error.rs b/src/client/socket/connection/output/error.rs
new file mode 100644
index 0000000..27547a1
--- /dev/null
+++ b/src/client/socket/connection/output/error.rs
@@ -0,0 +1,3 @@
+pub enum Error {
+    StreamWrite,
+}
diff --git a/src/client/socket/error.rs b/src/client/socket/error.rs
new file mode 100644
index 0000000..1863964
--- /dev/null
+++ b/src/client/socket/error.rs
@@ -0,0 +1,3 @@
+pub enum Error {
+    Connection,
+}