龙卷风：属性错误：'StaticHandler'对象没有属性'absolute_path'

Question

我正在使用Python Tornado构建一个简单的服务器。这是代码：

class IndexHandler(tornado.web.RequestHandler):
    def get(self, param):
        print("nnthis is a get request from indexhandler:")
        if param:
            #print("frontend/" + param)
            self.render("frontend/" + param)
            print("I'm html")
        else:
            print("index.html")
            self.render("index.html")
class StaticHandler(tornado.web.StaticFileHandler):
    def initialize(self, path, default_filename=None):
        self.root = os.path.abspath(path) + os.path.sep
        self.default_filename = default_filename
    def head(self, path):
        self.get(path, include_body=False)
    def get(self, param, include_body=True):
        abspath = "frontend/" + param
        print(abspath)
        myfile = open(abspath, "rb")
        try:
            self.write(myfile.read())
        finally:
            myfile.close()
class Application(tornado.web.Application):
    def __init__(self):
        handlers = [
                (r"/(.*jpg$)", StaticHandler, {"path": "/frontend"}),
                (r"/(.*css$)", StaticHandler, {"path": "/frontend"}),
                (r"/(.*html$)", IndexHandler)
                ]
        super(Application, self).__init__(handlers, **settings)

if __name__ == "__main__":
    tornado.options.parse_command_line()
    http_server = tornado.httpserver.HTTPServer(Application())
    http_server.listen(options.port)
    tornado.ioloop.IOLoop.instance().start()

但是，当我访问我的网站时，所有IMG和CSS文件都会出现错误：

Traceback (most recent call last):
      File "/usr/local/lib/python3.5/site-packages/tornado/web.py", line 1513, in _execute
        self.finish()
      File "/usr/local/lib/python3.5/site-packages/tornado/web.py", line 973, in finish
        self.set_etag_header()
      File "/usr/local/lib/python3.5/site-packages/tornado/web.py", line 1416, in set_etag_header
        etag = self.compute_etag()
      File "/usr/local/lib/python3.5/site-packages/tornado/web.py", line 2436, in compute_etag
        version_hash = self._get_cached_version(self.absolute_path)
    AttributeError: 'StaticHandler' object has no attribute 'absolute_path'
[E 170502 11:44:48 web:2063] 500 GET /css/reset.css (108.61.177.156) 2.06ms

Answer 1

请参阅staticfilehandler的文档，尤其是"子分类说明"：

子类仅应覆盖本节中讨论的方法；覆盖其他方法是容易出错的。由于与compute_etag和其他方法的紧密耦合，因此staticfilehandler均特别有问题。

要更改生成静态URL的方式(例如，匹配另一台服务器或CDN的行为(，Override make_static_url，parse_url_path，get_cache_time和/或get_version。

尤其是这里的问题是get应该设置self.absolute_path(请参阅此处的代码(，但是您已将该代码替换为自己的代码。

而不是覆盖get，我认为您要覆盖parse_url_path：

def parse_url_path(self, url_path):
    return 'frontend/' + url_path