通过iface2下v_download接口获取爱奇艺视频文件大小

这个接口的好处是不需要cookies，也不需要计算某个参数，替换tvid就可以用。
至于headers中的sign参数，通常情况下和t一起出现，有效期很长，另外目前不需要sign和t也能请求。
代码示例如下：

import requests
url = "http://iface2.iqiyi.com/video/3.0/v_download"
querystring = {"api":"nil","app_t":"1","app_p":"gphone","app_k":"69842642483add0a63503306d63f0443","app_v":"10.9.0","dev_ua":"Redmi","dev_os":"10","dev_hw":"null","album_id":"239229801","tv_id":"8502453100","platform_id":"10","play_core":"nil","net_sts":"16","usr_res":"512","secure_v":"1","secure_p":"GPhone","qdv":"1","api_v":"9.8","req_sn":"1571529770886"}
headers = {
    'sign': "abf536b8e1203ae3f2e6c5c8dbb9b65d",
    'User-Agent': "iqiyi/com.qiyi.video/10.9.0/NetLib-okhttp/3.12.5.1",
    't': "529636367",
    'Accept': "*/*",
    'Host': "iface2.iqiyi.com",
    'Accept-Encoding': "gzip, deflate"
}
response = requests.request("GET", url, headers=headers, params=querystring)
print(response.text)

返回示例

{
    "code": 0,
    "album": {
        "_blk": 0,
        "_cid": 2,
        "_ct": "2019-03-18 10:34:23",
        "_id": 239229801,
        "_img": "http://m.iqiyipic.com/image/20191010/5f/ad/a_100272782_m_601_m2_120_160.jpg",
        "_pc": 2,
        "_pid": 239229801,
        "_t": "光荣时代",
        "_tvct": 1,
        "_tvs": 46,
        "ctype": 0,
        "fst_time": "2019-04-25",
        "tv_id": 8502453100,
        "cpt_l": 1,
        "cpt_r": 2,
        "t_pc": 1,
        "_dn": "2736",
        "h1_img": "http://m.iqiyipic.com/image/20191010/5f/ad/a_100272782_m_601_m2_180_236.jpg",
        "boss_type": 99,
        "clm": "",
        "tvfcs": "张译黄志忠明暗对决",
        "year": "2019",
        "t": "光荣时代",
        "v2_img": "http://m.iqiyipic.com/image/20191010/5f/ad/a_100272782_m_601_m2_284_160.jpg",
        "logo": 1,
        "logo_position": -1,
        "logo_hidden": [],
        "business_type": []
    },
    "video": {
        "_id": 8502453100,
        "_n": "光荣时代第13集",
        "subtitle": "朝阳冒充中统",
        "_od": 13,
        "desc": "北平开始打击“粮老虎”，很多奸商被抓。郑朝阳从奸商的往来账目中发现了杨凤刚的驻地——平西沙子口旧矿场。郑朝阳化妆粮食商人一路做了记号到旧矿场见到杨凤刚，杨凤刚知道郑朝阳是警察。郑朝阳则冒充自己是中统骗过杨凤刚，但还是被关押起来。在关押处发现了冼怡竟然也关在这里。矿场外，包围圈完成。矿场里，杨凤刚获悉郑朝阳说谎。下令连冼怡一起处决。这时，冼登奎带着委任状来和杨凤刚谈判。城里，郑朝山从旧警察多门的口中探听到郑朝阳带人抓捕杨凤刚的情报，紧急给杨凤刚发报撤离。\n",
        "_img": "http://m.iqiyipic.com/image/20191014/77/39/v_139408871_m_601_160_90.jpg",
        "_dn": "2705",
        "s_t": 90,
        "e_t": 2530,
        "ts_res": {
            "16": {
                "vid": "becedab20c5e7a6f4a436d039cd0b103",
                "len": 368685759,
                "f4v_url": "",
                "m3u8_url": "",
                "dolby_len": 0,
                "h265_len": 0,
                "audio_aac_len": 0
            },
            "512": {
                "vid": "a509b538d47e0e59c0ac51c16863950e",
                "len": 704308245,
                "f4v_url": "",
                "m3u8_url": "",
                "dolby_len": 0,
                "h265_len": 0,
                "audio_aac_len": 0
            },
            "4": {
                "vid": "bc4a5528adf8ead809255ff2b5b183ea",
                "len": 121820901,
                "f4v_url": "",
                "m3u8_url": "",
                "dolby_len": 0,
                "h265_len": 0,
                "audio_aac_len": 0
            },
            "8": {
                "vid": "e633dfc4ecb17a5824a86c728ca2ed4e",
                "len": 163529602,
                "f4v_url": "",
                "m3u8_url": "",
                "dolby_len": 0,
                "h265_len": 0,
                "audio_aac_len": 0
            },
            "128": {
                "vid": "79fb300726b67a3d0dcdc0afd81d45b3",
                "len": 65016514,
                "f4v_url": "",
                "m3u8_url": "",
                "dolby_len": 0,
                "h265_len": 0,
                "audio_aac_len": 0
            }
        },
        "mp4_res": {
            "1": {
                "vid": "716a30d6ec16b88b819f991d5a83857f",
                "url": "",
                "len": 77340238
            },
            "32": {
                "vid": "ff9417948c6a9d9f96e7c8778228c27d",
                "url": "",
                "len": 128380783
            },
            "2": {
                "vid": "ff9417948c6a9d9f96e7c8778228c27d",
                "url": "",
                "len": 128380783
            }
        },
        "video_ctype": 0,
        "boss_type": 1,
        "pre_img": {
            "pre_img_url": "http://preimage2.iqiyipic.com/preimage/20191018/87/fe/v_139408871_m_612_m1_220_124.jpg",
            "rule": "1-30",
            "interval": 10
        },
        "ta": {
            "215235805": {
                "id": 215235805,
                "img": "http://pic2.iqiyipic.com/image/20191010/66/09/p_2001251_m_601_m3_128_128.jpg",
                "name": "黄志忠"
            },
            "204240905": {
                "id": 204240905,
                "img": "http://pic6.iqiyipic.com/image/20181229/94/97/p_1037073_m_601_m2_128_128.jpg",
                "name": "李添诺"
            },
            "203609805": {
                "id": 203609805,
                "img": "http://pic6.iqiyipic.com/image/20181229/08/12/p_1030762_m_601_m4_128_128.jpg",
                "name": "张译"
            },
            "234334505": {
                "id": 234334505,
                "img": "http://pic3.iqiyipic.com/image/20181228/ed/19/p_5232901_m_601_m2_128_128.jpg",
                "name": "张隽溢"
            },
            "215381805": {
                "id": 215381805,
                "img": "http://pic1.iqiyipic.com/image/20181229/ed/0d/p_2013408_m_601_m3_128_128.jpg",
                "name": "潘之琳"
            },
            "214463605": {
                "id": 214463605,
                "img": "http://pic7.iqiyipic.com/image/20181228/08/81/p_2008149_m_601_m6_128_128.jpg",
                "name": "黄品沅"
            },
            "214432805": {
                "id": 214432805,
                "img": "http://pic4.iqiyipic.com/image/20181229/da/a2/p_2006722_m_601_m3_128_128.jpg",
                "name": "王骁"
            }
        },
        "vip_type": "0",
        "pay_mark": 2,
        "business_type": [],
        "play_mode": 1,
        "fst_time": "20191019",
        "video_tail_start_point": 2530000,
        "bullet_num": "300"
    },
    "setting": {
        "dl_type": 4,
        "ts": "16,4,512,8,128",
        "authResult": {
            "auth_success": false
        }
    }
}

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原文链接：https://blog.weimo.info/archives/414/