这是返回的头信息
HTTP/1.1 200 OK
Server: JSP3/2.0.14
Date: Sun, 04 Apr 2021 04:08:09 GMT
Content-Type: image/jpeg
Content-Length: 608210
Connection: close
ETag: "036050da40c4d2a04cd280e8c46bd50e"
Last-Modified: Fri, 02 Apr 2021 06:41:59 GMT
Expires: Mon, 05 Apr 2021 08:15:59 GMT
Age: 154727
Accept-Ranges: bytes
Content-MD5: A2BQ2kDE0qBM0oDoxGvVDg==
x-bce-content-crc32: 0
x-bce-debug-id: 1EwL0t7dn/Suo5lxabBtidK7LMD4Y9lDILmV7Uibo47PRrZtEOTQO2Mqny44nHf3jU0tbyxDH3BGNMBlzOjYSg==
x-bce-request-id: d5a265a4-f0d1-478e-9f54-dda62aec9246
x-bce-storage-class: STANDARD
Timing-Allow-Origin: *
Ohc-Cache-HIT: wz7ct63 [3], xactcache63 [3], qdix63 [1]
Ohc-File-Size: 608210