CODEWITHSUNDEEP
pythonflaskflask-restful
Herdy
Herdy

Reputation: 139

Invalid unicode strings in Flask, when using parameters in routes

I use Flask to run a RESTful service and have discovered, that Unicode characters are not being passed correctly, when values are passed as parameters.

#!/usr/bin/env python
# -*- coding: utf-8 -*- 

...

@app.route('/search/<query>')
def Search(query):
    result = { "result": query }
    return jsonify(result), 200

When I call the service using a REST client with URL ...

http://localhost/search/zürich

... the output looks like this:

{
    "result": "z\ufffdrich"
}

When hard coding the query string like this:

@app.route('/search/<query>')
def Search(query):
    result = { "result": "Zürich" }
    return jsonify(result), 200

... the output is correctly encoded:

{
    "result": "Zürich"
}

So I digged in the Flask config options settings and have set the options parameter 'JSON_AS_ASCII' to false.

By default Flask serialize object to ascii-encoded JSON. If this is set to False Flask will not encode to ASCII and output strings as-is and return unicode strings. jsonify will automatically encode it in utf-8 then for transport for instance.

Is that a bug in Flask or did I miss anything in the Flask configuration setting?

Upvotes: 1

Views: 1726

Answers (1)

amanb
amanb

Reputation: 5463

This documentation means that if 

app.config['JSON_AS_ASCII'] = False

The output will be in unicode.

So it should be set to True to get the output in ASCII, which is what you want.

Upvotes: 1

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