在本教程中,我们将介绍如何实现 Web 呈现器的异步方法。您只需要将 HTML 内容发送到 SubmitPDFFromHTMLTask 或 SubmitImageFromHTMLTask API 方法即可接收任务标识符作为响应。还有SubmitPDFFromUrlTask和SubmitImageFromUrlTask方法,用于从公共Web Uri呈现PDF或图像。

收到任务标识符后,您需要通过调用 GetRenderingTaskStatus 方法来检查任务状态。只要任务状态等于“Waiting”,您需要在几秒钟延迟后调用相同的方法。一旦你从 GetRenderingTaskStatus 方法收到“Completed”,你可以调用 DownloadResult 方法来下载最终文件。您可以使用下面的 Python 实现。

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import requests
import time


def submit_pdf_from_html_task(htmlContent, uri, rapid_api_key):
    multipart_form_data = {
        'uri': (None, uri),
        'useCompression': (None, 'false'),
        'pageLabel': (None, 'Home Page'),
        'messageLabel': (None, 'Initial Capture'),
        'browserHeight': (None, '768'),
        'browserWidth': (None, '1024'),
        'htmlContent': (None, htmlContent)
    }

    headers = {
        'X-RapidAPI-Key': rapid_api_key
    }

    response = requests.post('https://web-renderer.p.rapidapi.com/SubmitPDFFromHTMLTask',
                             files=multipart_form_data, headers=headers)
    if response.status_code != 200:
        raise Exception('Cannot create task')

    return response.text


def get_rendering_task_status(task_id, rapid_api_key):
    params = {
        'taskId': task_id
    }

    headers = {
        'X-RapidAPI-Key': rapid_api_key
    }

    response = requests.get('https://web-renderer.p.rapidapi.com/GetRenderingTaskStatus',
                            headers=headers, params=params)
    if response.status_code != 200:
        raise Exception("Cannot check task status")

    return response.text


def download_result(task_id, rapid_api_key):
    params = {
        'taskId': task_id
    }

    headers = {
        'X-RapidAPI-Key': rapid_api_key
    }

    response = requests.get('https://web-renderer.p.rapidapi.com/DownloadResult', headers=headers,
                            params=params)
    if response.status_code != 200:
        raise Exception('Cannot download file')

    return response.content


if __name__ == '__main__':
    rapid_api_key = '<YOUR RAPIDAPI KEY HERE>'
    html_content = '<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"></head><body><h1>Hello World!</h1></body></html>'
    uriOfHtmlContent = 'https://www.google.com?hl=en'
    task_id = submit_pdf_from_html_task(html_content, uriOfHtmlContent, rapid_api_key)
    retry_count = 0
    while retry_count < 100:
        retry_count += 1
        time.sleep(5)
        status = get_rendering_task_status(task_id, rapid_api_key)
        if status == 'Completed':
            file_bytes = download_result(task_id, rapid_api_key)
            with open('html_from_html.pdf', mode='wb') as binary_pdf:
                binary_pdf.write(file_bytes)
            break
        elif status == 'Waiting':
            continue
        elif status == 'Failed':
            raise Exception('Cannot render html')
        else:
            raise Exception('Invalid status')