Bottle源码之HeaderDict详解

所有的框架请求响应都基于一个原理 http请求 --> wsgi服务器 --> wsgi接口(实际就是框架中自定义实现的函数经过底层封装) --> 响应 可以参考廖雪峰的教程中关于wsgi接口的讲解

class HeaderDict(dict):''' A dictionary with case insensitive (titled) keys.        You may add a list of strings to send multible headers with the same name.'''def __setitem__(self, key, value):return dict.__setitem__(self,key.title(), value) #注意这里使用title函数，它能将每个单词的开头大写def __getitem__(self, key):return dict.__getitem__(self,key.title())def __delitem__(self, key):return dict.__delitem__(self,key.title())def __contains__(self, key):return dict.__contains__(self,key.title())def items(self):""" Returns a list of (key, value) tuples """for key, values in dict.items(self):if not isinstance(values, list):
                values = [values]for value in values:yield (key, str(value))                def add(self, key, value):""" Adds a new header without deleting old ones """if isinstance(value, list):for v in value:self.add(key, v) #注意这里使用了递归elif key in self:if isinstance(self[key], list):self[key].append(value)else:self[key] = [self[key], value]else:          self[key] = [value] 

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