Flask serving binary data example

flask_binary.py

import io
from flask import Flask, send_file

app = Flask(__name__)

@app.route('/logo.jpg')
def logo():
    """Serves the logo image."""

    with open("logo.jpg", 'rb') as bites:
        return send_file(
                     io.BytesIO(bites.read()),
                     attachment_filename='logo.jpeg',
                     mimetype='image/jpg'
               )

You could simply give the bites object to send_file() instead of re-wrapping it in io.BytesIO().

@kirpit He would have to get rid of the with statement. It closes the stream before it's used.

I don't want to download image, Can online show the image?

@carvendy
http://flask.pocoo.org/snippets/118/

I had to add as_attachment=True to send_file to get it to work.
But thanks!

Hi!! Thanks for the code!!
I have a similar code in which multiple files are uploaded and then after processing, I have a string name "b64_encoded_string" as output now this has not to be saved anywhere but to return that string to the web app and download there as .pem file. Earlier I was using without flask and saving it via - pickle.dump( b64_encoded_string, open("license.pem", "wb")).

Instead, I don't want to save anything in the web app and push all the string and download it for the user as .pem file in-app.

If anybody can help me with this, it would be a great help.