My images are stored in a MongoDB, and I'd like to return them to the client, here is how the code is like:
@app.route("/images/<int:pid>.jpg")
def getImage(pid):
# get image binary from MongoDB, which is bson.Binary type
return image_binary
However, it seems that I can't return binary directly in Flask? My idea so far:
base64
of the image binary. The problem is that IE<8 doesn't support this.send_file
.Are there better solutions?
Create a response object with the data and then set the content type header. Set the content disposition header to attachment
if you want the browser to save the file instead of displaying it.
@app.route('/images/<int:pid>.jpg')
def get_image(pid):
image_binary = read_image(pid)
response = make_response(image_binary)
response.headers.set('Content-Type', 'image/jpeg')
response.headers.set(
'Content-Disposition', 'attachment', filename='%s.jpg' % pid)
return response
Relevant: werkzeug.Headers and flask.Response
You can pass a file-like oject to and the header arguments to send_file
to let it set up the complete response. Use io.BytesIO
for binary data:
return send_file(
io.BytesIO(image_binary),
mimetype='image/jpeg',
as_attachment=True,
attachment_filename='%s.jpg' % pid)