如何在同一个Chalice应用程序中从不同的路由返回image和json？

Question

我有一个最小完整的，可验证的示例圣杯应用程序：

from chalice import Chalice, Response
from urllib.request import Request, urlopen
from urllib.parse import unquote
import io

app = Chalice(app_name='photo')
app.api.binary_types =['*/*']

@app.route('/get-photo/{url}/{maxWidth}/{maxHeight}', methods=['GET'])
def getPhoto(url, maxWidth, maxHeight):
     return Response(
        load(unquote(url), int(maxWidth), int(maxHeight)),
        headers={ 'Content-Type': 'image/jpeg' },
        status_code=200)

def load(url, maxWidth, maxHeight):
    print(url)
    req = Request(url)
    req.add_header('accept', 'image/jpeg')
    image = urlopen(req).read()
    return thumbnail(image, maxWidth, maxHeight)

from PIL import Image

def thumbnail(image, maxWidth, maxHeight):

    im = Image.open(io.BytesIO(image))
    im.thumbnail((maxWidth,maxHeight), Image.ANTIALIAS)

    with io.BytesIO() as output:
        im.save(output, format="JPEG")
        return output.getvalue()

@app.route('/echo', methods=['POST'])
def preload():
    # MCVE
    return Response(app.current_request.json_body, status_code=200)

从目前的情况来看，/get-photo路由工作正常，但是/echo端点在用curl -H "Content-Type: application/json" -X POST -d '{"test":1}' https://...调用时失败

[ERROR] ValueError: Expected bytes type for body with binary Content-Type. Got <class 'str'> type body instead.
Traceback (most recent call last):
  File "/var/task/chalice/app.py", line 836, in __call__
    response = response.to_dict(self.api.binary_types)
  File "/var/task/chalice/app.py", line 375, in to_dict
    self._b64encode_body_if_needed(response, binary_types)
  File "/var/task/chalice/app.py", line 392, in _b64encode_body_if_needed
    body = self._base64encode(body)
  File "/var/task/chalice/app.py", line 400, in _base64encode
    % type(data))

如果我删除app.api.binary_types =['*/*']，那么/echo工作正常，但是我遇到了Chalice Framework: Request did not specify an Accept header with image/jpeg中描述的问题

如何使这两个路由在同一个应用程序中工作？你知道吗

Answer 1

通过将最后一行改为

return Response(json.dumps(app.current_request.json_body).encode('utf-8'), status_code=200)

更新

这项工作了一段时间，直到我遇到了额外的问题。然后，我根据返回类型将应用程序分为两部分。你知道吗