确定 Flask 请求是否来自 JavaScript [英] Identify if Flask request is from JavaScript or not

问题描述

我想创建一个 Flask 错误处理程序，如果请求来自 JavaScript，则返回 JSON 响应，否则返回重定向.我尝试使用 request.is_xhr，但即使对于 JavaScript 请求也是错误的.如何检查请求是否来自 JavaScript?

I want to create a Flask error handler that returns a JSON response if the request was from JavaScript but returns a redirect otherwise. I tried using request.is_xhr, but it is false even for JavaScript requests. How can I check if the request is from JavaScript?

@app.errorhandler(Exception)
def unhandled_exception(error):
    if request.is_xhr:
        return flask.jsonify(error='yes')

    return redirect(url_for('error'))

推荐答案

没有标准或可靠的方法来检测请求是否来自特定来源，例如 JavaScript.

There is no standard or reliable way to detect if a request comes from a particular source, such as JavaScript.

is_xhr 仅在某些 JavaScript 库(例如 jQuery)设置某个标头时才为真.大多数 JavaScript 不发送标头.由于这个原因，is_xhr 已被弃用.

is_xhr was only true when a certain header was set by some JavaScript libraries, such as jQuery. The header is not sent by most JavaScript. is_xhr has been deprecated for that reason.

您可以检查 Accept 标头以查看客户端是否要求 application/json，但这也是不可靠的.

You can check the Accept header to see if the client is asking for application/json, but that too is unreliable.

if request.is_xhr or request.accept_mimetypes.accept_json:
    return jsonify(...)

return redirect(...)

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