curl：command line tool and library for transferring data with URLs.
- 下载、Documentation Overview；
- curl: (1) Protocol "http not supported or disabled in libcurl；
- timeout https://ec.haxx.se/usingcurl-timeouts.html
Does curl have a timeout?
curl 上传文件示例
-
What is the right way to POST multipart/form-data using curl?
curl -v -F logo_img=@localfilename URL
libcurl error codes curl 命令执行返回码
- CURLE_WRITE_ERROR (23)
- CURLE_SSL_CERTPROBLEM (58)
problem with the local client certificate.
这个错误有时会出现，不明白原因；难道是在 linux、windows、mac os 之间传输 cert 文件导致的？
Getting (58) unable to use client certificate (no key found or wrong pass phrase?) from curl - CURLE_SSL_CACERT_BADFILE (77)
Problem with reading the SSL CA cert (path? access rights?)
通常是密钥文件的访问权限设置太宽泛导致。需要设置成 600 即可，而 644 是不行的。
Options
-
-I/--head：Fetch the HTTP-header only! 只返回 HTTP 头； -
-s/--silent
Silent or quiet mode. Don’t show progress meter or error messages. Makes Curl mute. -
-k, --insecure
(TLS) By default, every SSL connection curl makes is verified to be secure. This option allows curl to proceed and operate even for server connections otherwise considered insecure. The server connection is verified by making sure the server's certificate contains the right name and verifies successfully using the cert store.
curl man page
curl --cert /bin/sapi/sapiclient.crt --key /bin/sapi/sapiclient.key --cacert /bin/sapi/sapica.crt --connect-timeout 30 --max-time 60 "https://${serverdomain}/aps/sapiloader_up_tsinfo?
sn=${sn}&oemcode=${oemcode}&dev_model=${dev_model}&status=${1}&code=${2}&info=\"${3}\""
curl -k --connect-timeout 5 --max-time 10 -F 'file=@syslog.tar.gz;' "https://${logserverdomain}/aps/up_romdlog?sn=${sn}&oemcode=${oemcode}&dev_model=${dev_model}"
下载文件
$ curl -v -o x -k https://download.superhcloud.com/upload/loader/RG020ET-CA/sapipack.RG020ET-CA.201812251534_2.5.122111.tar.gz
% 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 120.27.217.226...
* TCP_NODELAY set
* Connected to download.superhcloud.com (120.27.217.226) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
* successfully set certificate verify locations:
* CAfile: C:/Program Files/Git/mingw64/ssl/certs/ca-bundle.crt
CApath: none
* TLSv1.2 (OUT), TLS header, Certificate Status (22):
} [5 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client hello (1):
} [512 bytes data]
* TLSv1.2 (IN), TLS handshake, Server hello (2):
{ [111 bytes data]
* NPN, negotiated HTTP1.1
{ [5 bytes data]
* TLSv1.2 (IN), TLS handshake, Certificate (11):
{ [843 bytes data]
* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
{ [205 bytes data]
* TLSv1.2 (IN), TLS handshake, Server finished (14):
{ [4 bytes data]
* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
} [70 bytes data]
* TLSv1.2 (OUT), TLS change cipher, Client hello (1):
} [1 bytes data]
* TLSv1.2 (OUT), TLS handshake, Next protocol (67):
} [36 bytes data]
* TLSv1.2 (OUT), TLS handshake, Finished (20):
} [16 bytes data]
* TLSv1.2 (IN), TLS change cipher, Client hello (1):
{ [1 bytes data]
* TLSv1.2 (IN), TLS handshake, Finished (20):
{ [16 bytes data]
* SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
* ALPN, server did not agree to a protocol
* Server certificate:
* subject: C=CN; ST=BEIJING; O=ZJZY; OU=ZJZY; CN=download.superhcloud.com
* start date: Jan 1 00:18:54 1970 GMT
* expire date: Dec 7 00:18:54 2069 GMT
* issuer: C=CN; ST=BEIJING; L=beijing; O=ZJZY; OU=zjzy; CN=superhcloud.com
* SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
} [5 bytes data]
> GET /upload/loader/RG020ET-CA/sapipack.RG020ET-CA.201812251534_2.5.122111.tar.gz HTTP/1.1
> Host: download.superhcloud.com
> User-Agent: curl/7.60.0
> Accept: */*
>
{ [5 bytes data]
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0< HTTP/1.1 200 OK
< Server: nginx
< Date: Tue, 25 Dec 2018 12:56:40 GMT
< Content-Type: application/octet-stream
< Content-Length: 355783
< Last-Modified: Tue, 25 Dec 2018 07:34:52 GMT
< Connection: keep-alive
< ETag: "5c21dd9c-56dc7"
< Accept-Ranges: bytes
<
{ [16133 bytes data]
100 347k 100 347k 0 0 397k 0 --:--:-- --:--:-- --:--:-- 397k
* Connection #0 to host download.superhcloud.com left intact
