如何将字符串解析为header object？

def parse_header_string(header_string):
    headers = {}
    lines = header_string.split('\n')
    for line in lines:
        if ':' in line:
            key, value = line.split(':', 1)
            key = key.strip()
            value = value.strip()
            if key in headers:
                # 如果存在相同的键，将多个值存储为数组
                if isinstance(headers[key], list):
                    headers[key].append(value)
                else:
                    headers[key] = [headers[key], value]
            else:
                headers[key] = value
    return headers

# 示例用法
header_string = "Content-Type: application/json\nAuthorization: Bearer token123\nX-Custom-Header: value"
headers = parse_header_string(header_string)
print(headers)

{
    'Content-Type': 'application/json',
    'Authorization': 'Bearer token123',
    'X-Custom-Header': 'value'
}