通过 Postman 发送 post 请求有效，但在使用 http 时无效答案

【问题标题】：Sending post request through Postman works but not when using http通过 Postman 发送 post 请求有效，但在使用 http 时无效
【发布时间】：2020-04-20 06:46:25
【问题描述】：

我正在将图像上传到我的服务器（现在它只是 localhost）。以下是我的views.py 中导致问题的部分代码。

valid_extensions = ['jpg', 'jpeg', 'png', 'gif']
images = request.data.getlist('images[]') #Error here I believe
directory = os.path.join(os.getcwd(), 'static', 'images', 'products')

for image in images:
    extension = os.path.splitext(image.name)[1][1:].lower()
    file_name = "".join(choice(ascii_lowercase) for i in range(16)) + "." + extension

    if extension in valid_extensions:
        file_path = os.path.join(directory, file_name)
        with open(file_path, 'wb+') as destination:
            for chunk in image.chunks():
                destination.write(chunk)
                ProductImage.objects.create(file_name=file_name, original_name=image.name, file_length=image.size, product=product, file_path=file_path.replace(os.getcwd(), '').replace('\\', '/'))
    else:
        data = {'full_messages': ['Image file type is not supported.']}
        return Response(data, status=status.HTTP_422_UNPROCESSABLE_ENTITY)

data = {'full_messages': ['Product created successfully.']}
return Response(data, status=status.HTTP_201_CREATED)

由于某种原因，当我通过 Postman 发送我的 post 请求时，它成功上传了文件，但是当我通过 HTTP (Angular 8) 发送相同的请求时，我在控制台中收到错误。

上面写着AttributeError: 'NoneType' object has no attribute 'decode'，如果我改变了

下面是从http发送的请求

以下是邮递员请求

编辑（包括回溯）

Traceback (most recent call last):
  File "/usr/local/Cellar/python/3.7.4_1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/wsgiref/handlers.py", line 137, in run
    self.result = application(self.environ, self.start_response)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/contrib/staticfiles/handlers.py", line 65, in __call__
    return self.application(environ, start_response)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/wsgi.py", line 141, in __call__
    response = self.get_response(request)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/base.py", line 75, in get_response
    response = self._middleware_chain(request)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 36, in inner
    response = response_for_exception(request, exc)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 90, in response_for_exception
    response = handle_uncaught_exception(request, get_resolver(get_urlconf()), sys.exc_info())
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/exception.py", line 125, in handle_uncaught_exception
    return debug.technical_500_response(request, *exc_info)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/views/debug.py", line 91, in technical_500_response
    text = reporter.get_traceback_text()
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/views/debug.py", line 340, in get_traceback_text
    c = Context(self.get_traceback_data(), autoescape=False, use_l10n=False)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/views/debug.py", line 305, in get_traceback_data
    'filtered_POST_items': list(self.filter.get_post_parameters(self.request).items()),
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/views/debug.py", line 177, in get_post_parameters
    return request.POST
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/core/handlers/wsgi.py", line 110, in _get_post
    self._load_post_and_files()
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/http/request.py", line 315, in _load_post_and_files
    self._post, self._files = self.parse_file_upload(self.META, data)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/http/request.py", line 274, in parse_file_upload
    parser = MultiPartParser(META, post_data, self.upload_handlers, self.encoding)
  File "/Users/akwild/Desktop/project1/backend/env/lib/python3.7/site-packages/django/http/multipartparser.py", line 72, in __init__
    raise MultiPartParserError('Invalid boundary in multipart: %s' % boundary.decode())
AttributeError: 'NoneType' object has no attribute 'decode'

【问题讨论】：

请显示完整的回溯，以及引发错误的行。
@ReinstateMonica 完成。
使用 Angular 发出的 POST 请求是否使用 Content-Type 标头“multipart/form-data”执行？
@OluwafemiSule 是的。 addProduct(status: number, item_type: number, name: string, description: string, price: number, stock: number, tags: string, categories: string, images: any) { return this.http.post<any>(PRODUCTS_API_URL + '/add/', {'name': name, 'item_type': item_type, 'status': status, 'description': description, 'price': price, 'stock': stock, 'tags[eeeeee]': tags, 'categories[dasdsa]': categories, 'images[]': images}, { headers: {'Authorization': 'Bearer ' + localStorage.getItem('jwt'), 'Content-Type': 'multipart/form-data'} }); }

标签： python django http django-rest-framework postman

【解决方案1】：

您应该在标题中添加 enctype 而不是 Content-Type。这对我有用。

 headers: new HttpHeaders({
        'enctype': 'multipart/form-data',
        'Authorization': 'Token ' + user.token
      })

【讨论】：