如何修复 Python bottle Unsupported response type: <class 'dict'>

问题：

你正在使用 bottle 运行 Python HTTP 服务器。当你访问 HTTP 服务器端点时，你看到类似这样的 HTTP 500 错误消息

bottle-error.txt

Unsupported response type: <class 'dict'>

Unsupported response type: <class 'dict'>

解决方案

发生这种情况是因为你试图返回 Python list 的字典，例如在

bottle-bad-example.py

from bottle import route, run, template, response

@route('/')
def index():
    # 我们期望 bottle 在这里返回 JSON
    # 但那没有发生！
    return [{"a": "b"}]

run(host='localhost', port=8080)

from bottle import route, run, template, response

@route('/')
def index():
    # 我们期望 bottle 在这里返回 JSON
    # 但那没有发生！
    return [{"a": "b"}]

run(host='localhost', port=8080)

为了解决此行为，你需要设置 response.content_type 并显式使用 json.dumps() 将 JSON 转换为字符串：

bottle-fixed-example.py

from bottle import route, run, template, response
import json

@route('/')
def index():
    response.content_type = 'application/json'
    return json.dumps([{"a": "b"}])

run(host='localhost', port=8080)

from bottle import route, run, template, response
import json

@route('/')
def index():
    response.content_type = 'application/json'
    return json.dumps([{"a": "b"}])

run(host='localhost', port=8080)

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