使用 Flask 顯示的影像錯誤或損壞

Question

我正在設定一個網頁應用程序，我需要在其中顯示一些圖像。我從 API 收到的圖像將 matplotlib 圖轉換為 png，然後使用 io 庫將其發送到主 Web 應用程式。因此，我在頁面上顯示的圖像幾乎總是顯示為不正確或錯誤。但如果我透過上下文選單在新頁面中開啟它們，它們就可以了。

所以這段發送圖表的程式碼

@app.route('/send-data-a', methods=['GET'])
def send_data_user_dynamic():
...some code for diagram...
image_stream1 = io.BytesIO()
        plt.savefig(image_stream1, format='png')
        image_stream1.seek(0)
        plt.close(fig)

        return send_file(image_stream1, mimetype='image/png')

我嘗試將時間戳放在主應用程式中，因此連結將是唯一的，但是沒有幫助

@app.route('/data', methods=['GET'])
def data():
    timestamp = int(time.time())

    user_dynamic = requests.get(f'http://127.0.0.1:5000/send-data-a?timestamp={timestamp}')
    user_amount = requests.get(f'http://127.0.0.1:5000/send-data-b?timestamp={timestamp}')
    kp_month = requests.get(f'http://127.0.0.1:5000/send-data-c?timestamp={timestamp}')
    kp_week = requests.get(f'http://127.0.0.1:5000/send-data-d?timestamp={timestamp}')

    return render_template('second.html',
                           user_dynamic=user_dynamic.url,
                           user_amount=user_amount.url,
                           kp_month=kp_month.url,
                           kp_week=kp_week.url)
if __name__ == '__main__':
    app.run(debug=True, port=5001)

並且有一個 html 模板可以輸出它們

<div class="diagram">
        <img src="{{ user_dynamic }}" alt="user_dynamic">
        <figcaption>some text</figcaption>
    </div>

Answer 1

import base64

user_dynamic_response = requests.get('http://127.0.0.1:5000/send-data-a')
user_amount_response = requests.get('http://127.0.0.1:5000/send-data-b')
kp_month_response = requests.get('http://127.0.0.1:5000/send-data-c')
kp_week_response = requests.get('http://127.0.0.1:5000/send-data-d')

user_dynamic_image_data = base64.b64encode(user_dynamic_response.content).decode('utf-8')
user_amount_image_data = base64.b64encode(user_amount_response.content).decode('utf-8')
kp_month_image_data = base64.b64encode(kp_month_response.content).decode('utf-8')
kp_week_image_data = base64.b64encode(kp_week_response.content).decode('utf-8')

return render_template('second.html',
                       user_dynamic=user_dynamic_image_data,
                       user_amount=user_amount_image_data,
                       kp_month=kp_month_image_data,
                       kp_week=kp_week_image_data)

所以呃這段程式碼解決了問題