Google App Engine 中的图像响应
我通过执行以下操作将用户的图像保存为 BlobProperty：
user.image = urlfetch.fetch(image_url).content
然后我使用 url 渲染该图像，例如：
/image/user_id
图像必须保存，因为当我执行 len(user.image) 时，我会得到数千个数字。在本地实例上，图像渲染正常。在已部署的应用程序上，我收到以下错误，当我转到图像网址时，浏览器中没有显示任何内容：
Traceback（最近一次调用最后一次）： 文件“/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py”，第 86 行，运行中 self.finish_response() 文件“/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py”，第 127 行，在 finish_response 中 自写（数据） 文件“/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py”，第202行，写入 断言类型（数据）是 StringType，“write() 参数必须是字符串” AssertionError: write() argument must be string
另外，这是提供图像的处理程序：
class ImageHandler(webapp2.RequestHandler):
""" Returns image based on id. """
def get(self, *args, **kwargs):
user = db.get(
db.Key.from_path('User', models.User.get_key_name(kwargs.get('id'))))
if user.image:
self.response.headers['Content-Type'] = "image/jpeg"
self.response.out.write(user.image)
else:
self.response.out.write("No image")
只是为了澄清，我尝试将内容类型设置为 jpeg 和 png。并且在本地服务器上一切正常。任何帮助将不胜感激。谢谢！
I am saving a user's image as a BlobProperty by doing:
user.image = urlfetch.fetch(image_url).content
Then I'm rendering that image using a url such as:
/image/user_id
The image must be saving because because when I do len(user.image) I get a number in the thousands. And on the local instance the image renders ok. On the deployed app, I get the following error, and when I go to the image url nothing shows in the browser:
Traceback (most recent call last):
File "/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py", line 86, in run
self.finish_response()
File "/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py", line 127, in finish_response
self.write(data)
File "/base/python27_runtime/python27_dist/lib/python2.7/wsgiref/handlers.py", line 202, in write
assert type(data) is StringType,"write() argument must be string"
AssertionError: write() argument must be string
Also, here's the handler that serves the image:
class ImageHandler(webapp2.RequestHandler):
""" Returns image based on id. """
def get(self, *args, **kwargs):
user = db.get(
db.Key.from_path('User', models.User.get_key_name(kwargs.get('id'))))
if user.image:
self.response.headers['Content-Type'] = "image/jpeg"
self.response.out.write(user.image)
else:
self.response.out.write("No image")
Just to clarify I tried both setting content-type to jpeg and png. And things are working ok on the local server. Any help would be appreciated. Thanks!
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为什么不将图像写入 blobstore 然后使用 send_blob() 机制？
http://code.google.com/appengine/docs/python /blobstore/overview.html#Serving_a_Blob
Why not write the image to the blobstore and then use the send_blob() mechanism?
http://code.google.com/appengine/docs/python/blobstore/overview.html#Serving_a_Blob
回答我的问题，这解决了一切：
这很令人困惑，因为文档中的示例没有将 BlobProperty 转换为字符串。
Answering my question, that fixes everything:
It's confusing because the example in the docs does not cast the BlobProperty as string.