Caching and performance

PDF generation is heavier than a normal metadata request because Microlink has to render the page and print it as a document. The fastest workflows skip unnecessary extraction and reduce rendering work.

Pdf-specific speedups

If you only need the PDF, disable metadata extraction:

The following examples show how to use the Microlink API with CLI, cURL, JavaScript, Python, Ruby, PHP & Golang, targeting 'https://rauchg.com/2014/7-principles-of-rich-web-applications' URL with 'pdf' & 'meta' API parameters:

CLI Microlink API example

microlink https://rauchg.com/2014/7-principles-of-rich-web-applications&pdf

cURL Microlink API example

curl -G "https://api.microlink.io" \
  -d "url=https://rauchg.com/2014/7-principles-of-rich-web-applications" \
  -d "pdf=true" \
  -d "meta=false"

JavaScript Microlink API example

import mql from '@microlink/mql'

const { data } = await mql('https://rauchg.com/2014/7-principles-of-rich-web-applications', {
  pdf: true,
  meta: false
})

Python Microlink API example

import requests

url = "https://api.microlink.io/"

querystring = {
    "url": "https://rauchg.com/2014/7-principles-of-rich-web-applications",
    "pdf": "true",
    "meta": "false"
}

response = requests.get(url, params=querystring)

print(response.json())

Ruby Microlink API example

require 'uri'
require 'net/http'

base_url = "https://api.microlink.io/"

params = {
  url: "https://rauchg.com/2014/7-principles-of-rich-web-applications",
  pdf: "true",
  meta: "false"
}

uri = URI(base_url)
uri.query = URI.encode_www_form(params)

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true

request = Net::HTTP::Get.new(uri)
response = http.request(request)

puts response.body

PHP Microlink API example

<?php

$baseUrl = "https://api.microlink.io/";

$params = [
    "url" => "https://rauchg.com/2014/7-principles-of-rich-web-applications",
    "pdf" => "true",
    "meta" => "false"
];

$query = http_build_query($params);
$url = $baseUrl . '?' . $query;

$curl = curl_init();

curl_setopt_array($curl, [
    CURLOPT_URL => $url,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_ENCODING => "",
    CURLOPT_MAXREDIRS => 10,
    CURLOPT_TIMEOUT => 30,
    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
    CURLOPT_CUSTOMREQUEST => "GET"
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
    echo "cURL Error #: " . $err;
} else {
    echo $response;
}

Golang Microlink API example

package main

import (
    "fmt"
    "net/http"
    "net/url"
    "io"
)

func main() {
    baseURL := "https://api.microlink.io"

    u, err := url.Parse(baseURL)
    if err != nil {
        panic(err)
    }
    q := u.Query()
    q.Set("url", "https://rauchg.com/2014/7-principles-of-rich-web-applications")
    q.Set("pdf", "true")
    q.Set("meta", "false")
    u.RawQuery = q.Encode()

    req, err := http.NewRequest("GET", u.String(), nil)
    if err != nil {
        panic(err)
    }

    client := &http.Client{}
    resp, err := client.Do(req)
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    body, err := io.ReadAll(resp.Body)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(body))
}

import mql from '@microlink/mql'

const { data } = await mql('https://rauchg.com/2014/7-principles-of-rich-web-applications', {
  pdf: true,
  meta: false
})

Skipping metadata is usually the single biggest speedup for PDF-only requests.

The most effective PDF-specific optimizations are:

Set meta: false for PDF-only requests.
Stay on mediaType: 'print' (default for PDFs) unless the page genuinely needs screen CSS.
Prefer waitForSelector over waitForTimeout.
Keep adblock: true — reduces page noise and third-party overhead.
Disable javascript when the page does not rely on client-side rendering.
Use filter: 'pdf' when you want a smaller JSON payload.

Cache strategy

For the cache controls that apply to all workflows — ttl, staleTtl, force, and how to verify caching through response headers — see caching patterns.

A recommended production setup for generated PDFs: