curl 与浏览器的结果不同

Question

我正在尝试使用 curl 从命令行下载以下 URL。如果通过浏览器请求相同的 URL，它就能够获取图像。但是对于 curl，服务器会终止 SSL 握手。只是使用完全相同的参数；我尝试了来自 google-chrome 和 firefox 的“开发者工具”的 curl 命令。但两者都因以下错误而失败。

在here 之前提出过这个问题，但没有有效的答案。我按照建议尝试了-http1.1，但没有成功。

https://floridakeyswebcams.tv/sloppycam/camarchive/0807.jpg

(base) (15:39 test@testcomp ~) > curl -v 'https://floridakeyswebcams.tv/sloppycam/camarchive/0807.jpg' -H 'Connection: keep-alive' -H 'Upgrade-Insecure-Requests: 1' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3' -H 'Accept-Encoding: gzip, deflate, br' -H 'Accept-Language: en-US,en;q=0.9,hi;q=0.8,mr;q=0.7' -H 'If-None-Match: "90cbf2d5a81d51:da782"' -H 'If-Modified-Since: Fri, 03 May 2019 12:07:53 GMT' --compressed
*   Trying 74.209.245.140...
* TCP_NODELAY set
* Connected to floridakeyswebcams.tv (74.209.245.140) port 443 (#0)
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /home/sagham/anaconda2/ssl/cacert.pem
  CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to         floridakeyswebcams.tv:443 
* Closing connection 0
curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to floridakeyswebcams.tv:443 

Answer 1

似乎 floridakeyswebcams.tv 需要 TLS1.3 支持，请使用 --tlsv1.3 参数，

curl --tlsv1.3 -v 'https://floridakeyswebcams.tv/sloppycam/camarchive/0807.jpg'

这是我在使用 --tlsv1.2 时得到的结果：

$ ./CURL.EXE https://floridakeyswebcams.tv/sloppycam/camarchive/0807.jpg --tlsv1.2 -vv
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0*   Trying 74.209.245.140...
* TCP_NODELAY set
* Connected to floridakeyswebcams.tv (74.209.245.140) port 443 (#0)
* schannel: next InitializeSecurityContext failed: SEC_E_ALGORITHM_MISMATCH (0x80090331) - The client and server cannot communicate, because they do not possess a common algorit
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
* Closing connection 0
* schannel: shutting down SSL/TLS connection with floridakeyswebcams.tv port 443
curl: (35) schannel: next InitializeSecurityContext failed: SEC_E_ALGORITHM_MISMATCH (0x80090331) - The client and server cannot communicate, because they do not possess a common algorit

如果我使用--tlsv1.3，这是（大致上，由于某种原因以错误的顺序打印）我会得到什么：

./CURL.EXE https://floridakeyswebcams.tv/sloppycam/camarchive/0807.jpg --tlsv1.3 -v
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current

                                 Dload  Upload   Total   Spent    Left  Speed

* TCP_NODELAY set

* Connected to floridakeyswebcams.tv (74.209.245.140) port 443 (#0)

> GET /sloppycam/camarchive/0807.jpg HTTP/1.1


> Host: floridakeyswebcams.tv


> User-Agent: curl/7.64.1


> Accept: */*


> 

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-截断的 jpg 二进制文件-

关于为什么这不是自动协商的问题仍然存在，我不确定，但我猜你的 TLS 后端不支持 tlv1.3，这可能与你刚刚得到一个神秘的原因有关错误..