通过ApifoxEcho学习curl/httpie命令

curl，用于发送请求的命令行工具，一个 HTTP 请求客户端（实际上它也可以做 FTP/SCP/TELNET 协议的事情，可类比于浏览器中的 fetch。

curl 是最为流行的 HTTP 请求命令行工具，在谷歌浏览器控制台的网络面板中，可将当前请求转化为 curl。

在学习及调试 HTTP 的过程中，可结合 curl 与 Apifo Echo 一同使用。

Apifox Echo 是 Apifox 出品的一款 HTTP 简单的接口请求和返回数据服务，可以模拟各种接口请求参数和返回数据的情况，供开发人员和测试人员学习测试 API 使用。

curl

直接发送 GET 请求：

$ curl ifconfig.me
118.73.227.215

curl --request

--request/-X，指定请求方法，如 POST 等。

$ curl \
  -X POST \
  -H "Accept: application/vnd.github+json" \ 
  -H "Authorization: token " \
  https://api.github.com/repos/OWNER/REPO/issues \
  -d '{"title":"Found a bug","body":"I'\''m having a problem with this.","assignees":["octocat"],"milestone":1,"labels":["bug"]}'

$ curl https://echo.apifox.com/post -X POST -H "a: 3" -H "b: 4"
{
  "args": {}, 
  "data": "", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "A": "3", 
    "Accept": "*/*", 
    "B": "4", 
    "Connection": "close", 
    "Host": "echo.apifox.com", 
    "User-Agent": "curl/7.79.1"
  }, 
  "json": null, 
  "origin": "118.113.0.137", 
  "url": "https://echo.apifox.com/post"
}

curl --head

--head/-I 发送 HEAD 请求，只需要返回 Response Header。

$ curl --head https://shanyue.tech
HTTP/2 200
server: Tengine
content-type: text/html; charset=utf-8
content-length: 33229
vary: Accept-Encoding
date: Tue, 21 Jun 2022 05:54:24 GMT
vary: Accept-Encoding
x-oss-request-id: 62B15D1050ED1C32320FE906
x-oss-cdn-auth: success
accept-ranges: bytes
etag: "F540C0D57CDB57215AF11970EF4AAEF6"
last-modified: Wed, 23 Mar 2022 14:57:44 GMT
x-oss-object-type: Normal
x-oss-hash-crc64ecma: 8545542358272103335
x-oss-storage-class: Standard
x-oss-meta-mtime: 1648047444.796073379
cache-control: no-cache
content-md5: 9UDA1XzbVyFa8Rlw70qu9g==
x-oss-server-time: 27
ali-swift-global-savetime: 1655790864
via: cache12.l2cn3051[290,290,200-0,M], cache4.l2cn3051[291,0], kunlun6.cn3145[383,382,200-0,M], kunlun3.cn3145[386,0]
x-cache: MISS TCP_MISS dirn:-2:-2
x-swift-savetime: Tue, 21 Jun 2022 05:54:24 GMT
x-swift-cachetime: 0
timing-allow-origin: *
eagleid: 791d26a916557908641262834e

curl --include

--include/-i，打印 Response Header 与 Response Body。

HTTP/1.1 200 OK
access-control-allow-origin: *
content-type: text/plain; charset=utf-8
content-length: 15
date: Wed, 17 Aug 2022 01:56:20 GMT
x-envoy-upstream-service-time: 1
strict-transport-security: max-age=2592000; includeSubDomains
server: istio-envoy
Via: 1.1 google

222.222.222.113%

curl --verbose

--verbose/-v，查看发送报文及 TLS handshake 的详细。

$ curl -vvv --head https://shanyue.tech
* Rebuilt URL to: https://shanyue.tech/
*   Trying 218.91.183.88...
* TCP_NODELAY set
* Connected to shanyue.tech (218.91.183.88) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, [no content] (0):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
*  subject: CN=shanyue.tech
*  start date: Feb  5 00:00:00 2022 GMT
*  expire date: Feb  6 23:59:59 2023 GMT
*  subjectAltName: host "shanyue.tech" matched cert's "shanyue.tech"
*  issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=Encryption Everywhere DV TLS CA - G1
*  SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* Using Stream ID: 1 (easy handle 0x55c5a8e24690)
* TLSv1.3 (OUT), TLS app data, [no content] (0):
> HEAD / HTTP/2
> Host: shanyue.tech
> User-Agent: curl/7.61.1
> Accept: */*
>
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, [no content] (0):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS app data, [no content] (0):
* Connection state changed (MAX_CONCURRENT_STREAMS == 128)!
* TLSv1.3 (OUT), TLS app data, [no content] (0):
* TLSv1.3 (IN), TLS app data, [no content] (0):

# 重定向两次后请求到数据
$ curl --location http://zhihu.com

# 可使用 --head，查看到三次响应
$ curl --head --location http://zhihu.com

# 发送 JSON 数据给服务器端，httpie 比 curl 方便很多，不需要自己手写 header，curl 默认为 application/x-www-form-urlencoded
$ http POST https://echo.apifox.com/post "a: 3" name=shanyue
$ curl -X POST https://echo.apifox.com/post -H "a: 3" -H "content-type: application/json" -d '{"name": "shanyue"}'

# 发送 Form 数据给服务器端，curl/httpie 都比较方便
$ http POST https://echo.apifox.com/post "a: 3" name=shanyue
$ curl -X POST https://echo.apifox.com/post -H "a: 3" -d name=shanyue

# 上传文件
$ http POST https://echo.apifox.com/post