Generate a document with full height in Python with aiohttp

In this guide, we'll show you how to generate a document with full height dynamically using Python and the aiohttp library to convert them to PDF using PDFShift's API.

When you're converting a document, you might want to generate a document with full height dynamically. This can be done by setting the format parameter to the request and passing it a custom "auto" value for the {height} part.

import aiohttp, asyncio, json, base64

# You can get an API key at https://pdfshift.io
api_key = 'sk_xxxxxxxxxxxx'

params = {
    'source': 'https://www.example.com',
    'format': '1280xauto'
}

response = None
try:
    auth = base64.b64encode(
        'api:{}'.format(api_key).encode('utf-8')
    ).decode('utf-8')

    async with aiohttp.ClientSession() as session:
        async with session.post(
            'https://api.pdfshift.io/v3/convert/pdf',
            headers={'Authorization': f'Basic {auth}'},
            json=params
        ) as response:
            if response.status >= 400:
                raise Exception('Invalid request: {}'.format(await response.text()))

            with open('result.pdf', 'wb') as f:
                f.write(await response.read())

            print('The PDF document was generated and saved to result.pdf')
except asyncio.TimeoutError:
    raise Exception('The request took too long to process')
except aiohttp.ClientError as e:
    raise Exception(f'An error occurred: {e}')
except Exception as e:
    # We highly recommend you to handle exceptions. Often, PDFShift will provide you with a clear explanation about what happened.
    # Moreover, in case of error, no PDF are returned !
    raise Exception(f'An error occurred: {e}')

The format parameter can accept various values, such as 'Letter', 'Legal', 'Tabloid', 'Ledger', 'A0', 'A1', 'A2', 'A3', 'A4', 'A5'.

But it can also accept a custom values that is defined per the width and height as follow: {width}x{height}

Both width and height are pixel value by default, but if you precise the unit (in "cm", "mm", "in" or "pt"). That unit will be used instead.

For instance, you can set a format of:

{
    "source": "https://www.example.com",
    "format": "21cmx29,7cm"
}

Now, if you want a "liquid" height, which will analyze the height of the page and use it as your format, you can set the {height} value to auto. So, instead of setting a fixed height such as 'format': '1280x1024', you can set 'format': '1280xauto' and the height will be calculated based on the content of the page.

For further details on the format property and its usage, please refer to our dedicated documentation.

We hope this guide was helpful. If you have any questions or noticed any issues on the code above,
feel free to drop us a line.