Scrapy FakeUserAgentError: Error occurred during getting browser

问题

I use Scrapy FakeUserAgent and keep getting this error on my Linux Server.

Traceback (most recent call last):
  File "/usr/local/lib64/python2.7/site-packages/twisted/internet/defer.py", line 1299, in _inlineCallbacks
    result = g.send(result)
  File "/usr/local/lib/python2.7/site-packages/scrapy/core/downloader/middleware.py", line 37, in process_request
    response = yield method(request=request, spider=spider)
  File "/usr/local/lib/python2.7/site-packages/scrapy_fake_useragent/middleware.py", line 27, in process_request
    request.headers.setdefault('User-Agent', self.ua.random)
  File "/usr/local/lib/python2.7/site-packages/fake_useragent/fake.py", line 98, in __getattr__
    raise FakeUserAgentError('Error occurred during getting browser')  # noqa
FakeUserAgentError: Error occurred during getting browser

I keep getting this error on the Linux server when I run multiple spiders concurrently. This error rarely happens on my own laptop. What should I do to avoid that? Do I have to raise the RAM or something? The server's spec is 512MB RAM and 1 vCPU.

回答1:

I am not sure about RAM and why the error only happens on the Linux Server with a minimum spec. I solved it by using fake-useragent fallback feature. Sadly, scrapy-fake-useragent doesn't give any feature to set it conveniently, so I have to override the middleware feature on middlewares.py like this:

from fake_useragent import UserAgent
from scrapy_fake_useragent.middleware import RandomUserAgentMiddleware

class FakeUserAgentMiddleware(RandomUserAgentMiddleware):
    def __init__(self, crawler):
        super(FakeUserAgentMiddleware, self).__init__(crawler)
        # If failed to get random user agent, use the most common one
        self.ua = UserAgent(fallback='Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36')
        self.per_proxy = crawler.settings.get('RANDOM_UA_PER_PROXY', False)
        self.ua_type = crawler.settings.get('RANDOM_UA_TYPE', 'random')
        self.proxy2ua = {}

Then I activate the middleware on settings.py like this:

DOWNLOADER_MIDDLEWARES = {
    'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware': None,
    # 'scrapy_fake_useragent.middleware.RandomUserAgentMiddleware': 400, # disable the original middleware
    'myproject.middlewares.FakeUserAgentMiddleware': 400,
    # omitted
}