最近在写接口自动化的测试平台，在请求接口回填响应头数据的这一步遇到了一个小问题，想要通过requests库自带的获取响应头的方法（r.headers），然后拿到值后传给前端进行展示，展示效果如下：
开始调试时一切都好好的，但为了将该数据做保存记录的时候出了一些问题，报了一个不常见的错误：
第一反应是django序列化相关的的问题，按报错日志追溯到是代码中通过ORM批量创建数据入库的这一步报错，分析了一下还是没有啥头绪：
打了断点、加注释调试也没发现什么结果，也没有怀疑是因为增加了获取响应header这个操作导致的问题，后面实在无头绪将这部分代码注释后就不报错，能够正常运行了！
然后经过一些调试发现requests返回的响应header是:<class 'requests.structures.CaseInsensitiveDict'>这个类型，这是一个requests自定义的数据结构，是一个不区分大小写的纯字符串键的数据结构，它也会包含一些byte数据所以在序列其为json字符串时会报错：
class CaseInsensitiveDict(MutableMapping): """A case-insensitive ``dict``-like object. Implements all methods and operations of ``MutableMapping`` as well as dict's ``copy``. Also provides ``lower_items``. All keys are expected to be strings. The structure remembers the case of the last key to be set, and ``iter(instance)``, ``keys()``, ``items()``, ``iterkeys()``, and ``iteritems()`` will contain case-sensitive keys. However, querying and contains testing is case insensitive:: cid = CaseInsensitiveDict() cid['Accept'] = 'application/json' cid['aCCEPT'] == 'application/json' # True list(cid) == ['Accept'] # True For example, ``headers['content-encoding']`` will return the value of a ``'Content-Encoding'`` response header, regardless of how the header name was originally stored. If the constructor, ``.update``, or equality comparison operations are given keys that have equal ``.lower()``s, the behavior is undefined. """ def __init__(self, data=None, **kwargs): self._store = OrderedDict() if data is None: data = {} self.update(data, **kwargs) def __setitem__(self, key, value): # Use the lowercased key for lookups, but store the actual # key alongside the value. self._store[key.lower()] = (key, value) def __getitem__(self, key): return self._store[key.lower()][1] def __delitem__(self, key): del self._store[key.lower()] def __iter__(self): return (casedkey for casedkey, mappedvalue in self._store.values()) def __len__(self): return len(self._store) def lower_items(self): """Like iteritems(), but with all lowercase keys.""" return ( (lowerkey, keyval[1]) for (lowerkey, keyval) in self._store.items() ) def __eq__(self, other): if isinstance(other, Mapping): other = CaseInsensitiveDict(other) else: return NotImplemented # Compare insensitively return dict(self.lower_items()) == dict(other.lower_items()) # Copy is required def copy(self): return CaseInsensitiveDict(self._store.values()) def __repr__(self): return str(dict(self.items()))
所以这里我直接将其转换为dict类型就可以解决这个问题：
原：req_log['res_headers'] = r.headers 改：req_log['res_headers'] = dict(r.headers)
我也并未花更多时间去研究该数据结构的功能，这里主要是做个笔记提醒自己。
