回答編集履歴
1
サンプルコードに secret_key を追加
answer
CHANGED
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@@ -21,10 +21,14 @@
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```python
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"""view file."""
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from flask import Flask
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from flask import render_template
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from flask_wtf import FlaskForm
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from wtforms import StringField
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from wtforms.validators import Length, Required, URL
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app = Flask(__name__)
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app.secret_key = 'foobarfoobarfoobarfoobarfoobar'
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class UrlForm(FlaskForm):
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url = StringField(
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