用requests.post上传图片到e站实现自动搜索，但post出错

Question

import requests
from fake_useragent import UserAgent
import io
#https://e-hentai.org/?f_shash=nofile&fs_from=  ex搜图
from lxml.html import fromstring
url = 'https://upld.e-hentai.org/image_lookup.php'
jsonpath=r'C:\Users\Accepted\Desktop\python\通用'
proxies={'http':'http://127.0.0.1:7891','https':'http:127.0.0.1:7891'}
headers={
    "Cookie": "ipb_member_id=5778116; ipb_pass_hash=702680826f91a819da80b61be152e9d7; sk=54azub075xa1furqmeh6hn67qzb9; event=1637501119",
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
    'Accept-Encoding': 'gzip, deflate',
    'Accept-Language': 'zh-CN,zh;q=0.9',
    'Cache-Control': 'max-age=0',
    'Connection': 'keep-alive',
    'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryB0NrMSYMfjY5r0l1',
    'Host': 'e-hentai.org',
    'Origin': 'https://e-hentai.org',
    'Referer': 'https://e-hentai.org/?f_shash=nofile&fs_from=',
    'Sec-Fetch-Dest': 'document',
    'Sec-Fetch-Mode': 'navigate',
    'Sec-Fetch-Site': 'same-origin',
    'Sec-Fetch-User': '?1',
    'Upgrade-Insecure-Requests': '1',
    'User-Agent': str(UserAgent(path=rf'{jsonpath}\ua.json').random)
}

files = {
    'fs_similar':'on',
    'f_sfile':'search',
    'boundary':'----WebKitFormBoundaryB0NrMSYMfjY5r0l1',
    'file': ('白丝.jpg', open(r'C:\Users\Accepted\Desktop\白丝.jpg', 'rb'), 'image/jpeg')  # image或者file
}
r = requests.post(url=url, headers=headers, files=files,proxies=proxies)
print(r.text)
print(r.status_code)

其中r的内容和post之前的内容是一样的，是files内容有错吗