cURL 命令在 git bash 中有效，但在 cmd 和 powershell 中无效

Question

以下命令在 git bash 中有效，但在 cmd 和 powershell 中无效

curl -X POST http://localhost:5678/api/findgen -H 'Content-Type: application/json' -d '{"a": "Val 1","b": "Val 2","c": "Val 3","d": "Val 4"}' -o "file.json"

我在 cmd 中遇到错误，例如 -

curl: (6) Could not resolve host: application

curl: (6) Could not resolve host: Val 1,b

curl: (6) Could not resolve host: Val 2,c

curl: (6) Could not resolve host: Val 3,d

curl: (3) [globbing] unmatched close brace/bracket in column 6

可能是什么问题？

Answer 1

刚刚阅读错误信息：

Invoke-WebRequest Cannot bind parameter 'Headers'. Cannot convert the "Content-Type: application/json" value of type "System.String" to type "System.Collections.IDictionary".

在 PowerShell 中，curl 是 Invoke-WebRequest cmdlet 的别名。正如错误指出的那样，Header 参数必须是 IDictionary，而不是字符串。这是它在 PowerShell 中的样子：

@{"Content-Type"= "application/json"}

一些参数也不同。这就是我编写请求脚本的方式：

Invoke-WebRequest `
    -Uri "http://localhost:5678/api/findgen" `
    -Headers @{"Content-Type"= "application/json"} `
    -Body '{"a": "Val 1","b": "Val 2","c": "Val 3","d": "Val 4"}' `
    -OutFile "file.json" `
    -Method Post

Answer 2

我在 Windows 10（内部版本 17063 或更高版本）上只看到 C:\Windows\System32\curl.exe 的那些“Could not resolve host”，因为 Windows curl.exe native program 解释单精度和双精度的方式报价。

如果你 inverse/escape 这些引号，它确实有效（在 CMD 上）

C:\Windows\System32\curl -X POST http://localhost:5678/api/findgen \
  -H "Content-Type: application/json" \
    ^^^
     double-quotes
  -d "{\"a\": \"Val 1\",\"b\": \"Val 2\",\"c\": \"Val 3\",\"d\": \"Val 4\"}" -o "file.json"
     ^^^
     double quotes outside, escaped double-quotes inside: valid JSON

这类似于“How do I POST JSON with Curl?”

在 Powershell 上，我不得不转义双引号（如评论中的反引号），并转义 {}: {{}}

PS D:\> C:\Windows\System32\curl -X POST https://reqbin.com/echo/post/json `
   -H "Content-Type: application/json" `
   -d "{{`"login`":`"my_login`",`"password`":`"my_password`"}}"

或者：

PS D:\> C:\Windows\System32\curl.exe -X POST https://reqbin.com/echo/post/json `
>>    -H "Content-Type: application/json" `
>>    -d '{{""login"":""my_login"",""password"":""my_password""}}'
{"success":"true"}

来自史蒂文的post：

PS D:\> C:\Windows\System32\curl.exe -X POST -H "Content-Type: application/json" `
    -d '{""north"": ""each south""}' https://reqbin.com/echo/post/json
{"success":"true"}

单独使用curl.exe意味着使用MingW Git for Windows curl.exe

PS D:\> curl.exe -X POST -H "Content-Type: application/json" `
>>     -d '{""north"": ""each south""}' https://reqbin.com/echo/post/json
curl: (6) Could not resolve host: each
curl: (3) unmatched close brace/bracket in URL position 6:
south} https://reqbin.com/echo/post/json

因此您需要转义大括号，并删除任何 space:

PS D:\> curl.exe -X POST -H "Content-Type: application/json" `
>>     -d '{{"north":"each south"}}' https://reqbin.com/echo/post/json
{"success":"true"}

或者，使用 spaces，带单引号：

PS D:\> curl.exe -X POST -H "Content-Type: application/json" `
>>     -d '{\"north\": \"each south\"}' https://reqbin.com/echo/post/json
{"success":"true"}

在 CMD 上如果你想保持这些引号不变，使用 mingw curl.exe packaged with Git For Windows，至少在 CMD 上。

C:\path\to\git\mingw64\bin\curl.exe -X POST http://localhost:5678/api/findgen \
  -H 'Content-Type: application/json' \
  -d '{"a": "Val 1","b": "Val 2","c": "Val 3","d": "Val 4"}' -o "file.json"
     ^^^
     You can keep the quotes as-is

作为，在 Powershell 会话中，curl 本身是 Invoke-WebRequest.

的别名

我测试了它：

PS D:\> Get-Alias -Name curl

CommandType     Name                                               Version    Source
-----------     ----                                               -------    ------
Alias           curl -> Invoke-WebRequest


PS D:\> curl -uri https://reqbin.com/echo/post/json `
>>     -Method 'POST' -ContentType "application/json" `
>>     -Body "{""login"":""my_login"",""password"":""my_password""}"


StatusCode        : 200
StatusDescription : OK
Content           : {"success":"true"}

RawContent        : HTTP/1.1 200 OK
                    Connection: keep-alive
                    CF-Cache-Status: DYNAMIC
                    cf-request-id: 0917a97460000053c82aa69000000001
                    Expect-CT: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/bea...
Forms             : {}
Headers           : {[Connection, keep-alive], [CF-Cache-Status, DYNAMIC], [cf-request-id, 0917a97460000053c82aa69000000001], [Expect-CT, max-age=604800,
                    report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"]...}
Images            : {}
InputFields       : {}
Links             : {}
ParsedHtml        : System.__ComObject
RawContentLength  : 19

Answer 3

所以这里是作为一个衬里的改编语法：

curl.exe "-X" "POST" "https://reqbin.com/echo/post/json" `
"-H" "Content-Type: application/json" `
"-d" '{\"a\": \"Val 1\",\"b\": \"Val 2\",\"c\": \"Val 3\",\"d\": \"Val 4\"}' `
"-o" "file.json"

还有一种对 JSON 更友好的方式：

curl.exe "-X" "POST" "https://reqbin.com/echo/post/json" `
"-H" "Content-Type: application/json" `
"-d" (@{a='Val 1';b='val 2';c='Val 3';d='Val 4'} | ConvertTo-Json -Compress) `
"-o" "file.json"

cURL 命令在 git bash 中有效，但在 cmd 和 powershell 中无效

cURL command works in git bash but not in cmd and powershell

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