Basics

Before doing anything you need to start a server.

Create a new server with servers.New(), then followup with servers.Start() in order to start a server.

main.go

package main

import "main/lib/core/servers"

var server = servers.New()      // Creates server.

func main() {
    defer servers.Start(server) // Starts server.
}

Routes

Each server exposes a slice of Routes which you can freely modify.

You can add a new route by appending to or overwriting server.Routes.

main.go

package main

import (
    "main/lib/core/servers"
    "main/lib/routes/welcome"
)

var server = servers.New()                        // Creates server.

func main() {
    defer servers.Start(server)                   // Starts server.
    server.Routes = []routes.Route{               // Overwrites routes.
       {Pattern: "GET /", Handler: welcome.View}, // Adds route.
    }
}

Where welcome.View is a function pointer.

lib/routes/welcome/view.go

package welcome

import "main/lib/core/clients"

func View(client *clients.Client) {}

Path Fields

Route patterns can define dynamic path fields using {} syntax.

routes.Route{Pattern: "GET /{name}", Handler: welcome.View}

Path fields can then be retrieved with receive.Path().

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
)

func View(client *clients.Client) {
    _ = receive.Path(client, "name") // Retrieves field "name".
}

Messages

Use receive.Message() to retrieve messages sent by the client.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
)

func View(client *clients.Client) {
    _ = receive.Message(client) // Retrieves message.
}

Use send.Message() to send a message to the client.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    send.Message(client, "Hello.") // Sends message.
}

Headers

Use receive.Header() to retrieve header fields sent by the client.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
)

func View(client *clients.Client) {
    _ = receive.Header(client, "Accept") // Retrieves field "Accept".
}

Use send.Header() to send header fields to the client.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    accept := receive.Header(client, "Accept")  // Retrieves field "Accept".
    send.Header(client, "Content-Type", accept) // Sends it back.
}

Status

Use send.Status() to send the status of the response to the client.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    send.Status(client, 404)           // Sends status 404.
    send.Message(client, "Not found.") // Sends message.
}

Caution

Sending header fields or status after sending out content is not allowed. Read below.

Order of Operations

Order of operations matters when sending data to the client.

Caution

Status codes and headers cannot be modified after sending out content.

For example, sending the status code with send.Status() after you’ve already sent content with send.Message() is not allowed.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    send.Message(client, "Hello.") // Sends message. (Succeeds).
    send.Status(client, 404)       // Sends status (Fails).
}

send.Status(client, 404) will fail and the client will receive status 200 instead of 404.

HTTP/1.1 200 OK
Date: Sun, 25 May 2025 02:00:37 GMT
Content-Length: 6
Content-Type: text/plain; charset=utf-8

Hello.

The failure is logged to the server’s error logger.

Assuming you’re using the default error logger, you’ll see an error of sorts in your console

listening for requests at http://127.0.0.1:8080
status is locked

status is locked, meaning the status code has already been sent to the client and there’s nothing you can do about it.

Queries

Use receive.Query() to retrieve query fields.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    name := receive.Query(client, "name") // Retrieves field "name".
    send.Message(client, "Hello " + name) // Sends message.
}

Forms

Use receive.Form() to parse incoming content as multipart form or url encoded form when using POST and GET http verbs.

routes.Route{Pattern: "POST /", Handler: welcome.View}
// or
routes.Route{Pattern: "GET /", Handler: welcome.View}

lib/routes/welcome/action.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
    "main/lib/core/send"
)

type Form struct {                             // Defines a struct in which to
    Name string `form:"name"`                  // store the form content.
}

func View(client *clients.Client) {
    var form Form
    receive.Form(client, &form)                // Retrieves form.
    send.Message(client, "Hello " + form.Name) // Sends message.
}

Tip

You can also use a json tag, it will match the field correctly as if it were a form tag.
This is so that you can integrate your structs more easily with other libraries that only take into account json formats.

Tip

Form structs can define slices and files.

type Form struct {
    Name     string               `form:"name"`
    Comments []string             `form:"comments"` // slice of strings
    File     multipart.FileHeader `form:"file"`     // file handler
}

You can open and read the file.

src, _ := form.File.Open()
dst, _ := os.Create("my-file.txt")
io.Copy(src, dst)

Remember to close your files.

defer src.Close()
defer dst.Close()

Json

Use receive.Json() to parse incoming content as json when using POST and PUT http verbs and send.Json() to send json content.

routes.Route{Pattern: "POST /", Handler: welcome.View}
// or
routes.Route{Pattern: "PUT /", Handler: welcome.View}

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
    "main/lib/core/send"
)

type GreetingDetails struct {      // Defines a struct in which to
    Name string `json:"name"`      // store the json content.
}

func View(client *clients.Client) {
    var details GreetingDetails    // Creates a zero value.
    receive.Json(client, &details) // Unmarshals the content into details.
    send.Json(client, details)     // Sends content back as json.
}

Cookies

Use receive.Cookie() to retrieve cookies and send.Cookie() to send them.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    nickname := receive.Cookie(client, "nickname") // Retrieves cookie.
    send.Cookie(client, "nickname", nickname)      // Sends it back.
}

Session Id

Use receive.SessionId() to retrieve the client’s session id.

Note

The session id is retrieved from the client’s session-id cookie.
If the client doesn’t provide such cookie, receive.SessionId() creates a new session id and sends the cookie to the client.

Caution

Since receive.SessionId() might send a cookie to the client, it is important to remember that order of operations matters.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/receive"
)

func View(client *clients.Client) {
    _ = receive.SessionId(client) // Retrieves session id.
}

Redirect

Use send.Redirect() to redirect to a different location.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    send.Redirect(client, "/login", 307) // Redirects to /login.
}

Navigate

Use send.Navigate() to redirect to a different location with status 302.

lib/routes/welcome/view.go

package welcome

import (
    "main/lib/core/clients"
    "main/lib/core/send"
)

func View(client *clients.Client) {
    send.Navigate(client, "/login") // Redirects to /login with status 302.
}