如何在falcon中读取req主体中发送的图像

Question

在POST正文中发送jpg图像，使用postman这样做：

用图像、文本和相似性来阅读。py:

import json
class ImageTextSimilarity():
    def on_post(self, req, resp):
        image_raw = json.loads(req.stream.read())

哪些错误与

Traceback (most recent call last):
  File "/home/dario/.local/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 134, in handle
    self.handle_request(listener, req, client, addr)
  File "/home/dario/.local/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 175, in handle_request
    respiter = self.wsgi(environ, resp.start_response)
  File "falcon/api.py", line 274, in falcon.api.API.__call__
  File "falcon/api.py", line 269, in falcon.api.API.__call__
  File "/home/dario/ImageTextSimilarityApp/image_text_similarity.py", line 95, in on_post
    image_raw = json.loads(req.stream.read())
  File "/usr/lib/python3.6/json/__init__.py", line 349, in loads
    s = s.decode(detect_encoding(s), 'surrogatepass')
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

剩下的代码是image_similarity_app。py:

import falcon
from image_text_similarity import ImageTextSimilarity

api = application = falcon.API()
api.req_options.auto_parse_form_urlencoded = True
image_text_similarity_object = ImageTextSimilarity()
api.add_route('/image_text_similarity', image_text_similarity_object)

并以gun icornimage_similarity_app启动服务

Answer 1

我不是邮递员方面的专家，但通过选择二进制，您似乎正在发送JPEG图像数据作为请求主体：邮递员Chrome：表单数据、x-www-form-urlencoded和原始数据之间的区别是什么

在Falcon中，您只需将请求负载读取为

jpeg_data = req.stream.read()

（请注意，在某些应用服务器上，例如stdlib的wsgiref.simple_server，您可能需要使用安全的Request.bounded_stream包装器。）

另请参阅Falcon的WSGI和ASGI教程以获取灵感；他们使用非常相关的主题（构建图像服务）来说明框架的基本概念。您将找到如何处理RESTful图像资源的示例：上传、转换、存储、列表、服务、缓存等。