The Context Object

The context object is an object that is passed as the second argument to the handler function which contains additional information related to the current request

Params Object

if the handler is registered as a path restricted handler or as a route handler the params object contains all the dynamic path params that are matched by the current route

Example

/// ...
app.use("/test/:a/hi/:b", (request, context) => {
    const { a, b } = context.params;
    return response(`a = ${a} and b = ${b}`)
})
/// ...

Pattern

pattern is related to the path restricted handlers, pattern is a URLPattern object that successfully matched for the current path

You most likely won't need to use this option

Headers Object

These are the response headers for the current response you can set and get response headers from here. Headers is a standard web API

Note: You can directly set the headers of the response as a part of the response constructor but this is useful when the current handler wants to set response headers but doesn't necessarily return a response, like the cors handler uses this feature to set cors headers

Example

/// ...
app.use((request, context) => {
    context.headers.set("X-header", "Header Value")
    return response("Sent a response with headers")
})
/// ...

Connection Object

Information about the connection a request arrived on.

It has 2 properties

1. localAddr
   • Stores the local address of the connection.
2. remoteAddr
   • Stores remote address of the connection.

Both of them are of type Deno.Addr

Example

/// ...
app.use((request, context) => {
    const { localAddr, remoteAddr } = context.conn;
    console.log(localAddr, remoteAddr);
    return response("Hello")
})
/// ...