curl:如何发送带有请求正文的HEAD请求

Question

我想发送一个带有请求正文的HEAD请求。

所以我尝试了下面的命令。但是我得到了一些错误。

$ curl -X HEAD http://localhost:8080 -d "test"
Warning: Setting custom HTTP method to HEAD with -X/--request may not work the
Warning: way you want. Consider using -I/--head instead.
curl: (18) transfer closed with 11 bytes remaining to read

或者我试过这个:

$ curl -I http://localhost:8080 -d "test"
Warning: You can only select one HTTP request method! You asked for both POST
Warning: (-d, --data) and HEAD (-I, --head).

我认为RFC没有禁止发送带有请求体的HEAD请求。

如何发送?

Answer 1

默认为-d/--data，方法"POST";使用。

对于-I/--head，建议使用"HEAD";方法。

您的服务如何接受哪个方法(POST或HEAD) ?

我使用"https://httpbin.org";测试站点

对于cURL，您可以像这样使用POST:

$ curl --silent --include https://httpbin.org/post -d "data=spam_and_eggs"
HTTP/2 200 
date: Thu, 30 Sep 2021 18:57:02 GMT
content-type: application/json
content-length: 438
server: gunicorn/19.9.0
access-control-allow-origin: *
access-control-allow-credentials: true
{
"args": {}, 
"data": "", 
"files": {}, 
"form": {
"data": "spam_and_eggs"
}, 
"headers": {
"Accept": "*/*", 
"Content-Length": "18", 
"Content-Type": "application/x-www-form-urlencoded", 
"Host": "httpbin.org", 
"User-Agent": "curl/7.71.1", 
"X-Amzn-Trace-Id": "Root=1-6156087e-6b04f4645dce993909a95b24"
}, 
"json": null, 
"origin": "86.245.210.158", 
"url": "https://httpbin.org/post"
}

或";HEAD";方法:

$ curl --silent -X HEAD --include https://httpbin.org/headers -d "data=spam_and_eggs"
HTTP/2 200 
date: Thu, 30 Sep 2021 18:58:30 GMT
content-type: application/json
content-length: 260
server: gunicorn/19.9.0
access-control-allow-origin: *
access-control-allow-credentials: true

我检查了strace(使用HTTP协议)，HEAD请求的数据被传递到服务器:

sendto(5, "HEAD /headers HTTP/1.1rnHost: httpbin.orgrnUser-Agent: curl/7.71.1rnAccept: */*rnContent-Length: 18rnContent-Type: application/x-www-form-urlencodedrnrndata=spam_and_eggs", 170, MSG_NOSIGNAL, NULL, 0) = 170

当然，没有"--silent";选项，则出现警告消息:

Warning: Setting custom HTTP method to HEAD with -X/--request may not work the 
Warning: way you want. Consider using -I/--head instead.

我的研究是基于这个非常古老的帖子:https://serverfault.com/questions/140149/difference-between-curl-i-and-curl-x-head