debug – cURL で POST データを表示するには?

curl debug

例として、-v引数でWebサーバにPOSTした場合

curl -v http://testserver.com/post -d "firstname=john&lastname=doe"

そして、その出力は

> POST /post HTTP/1.1
> User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8l zlib/1.2.3
> Host: testserver.com
> Accept: */*
> Content-Length: 28
> Content-Type: application/x-www-form-urlencoded
>
< HTTP/1.1 200 OK
(etc)

投稿したデータについては一切触れられていません

cURLに「firstname=john&lastname=doe」という文字列を出力に表示するオプションはありますか?

注: 明らかに私が欲しい文字列は私が実行したコマンドの中にありますが、他にも–formや–data-asciiなどのポストオプションがいくつかあります。生データがサーバーに送信されるのを見てみたいと思います

  160  gak  2011-06-01


ベストアンサー

tcpdumpを使わずに一番近いのは--trace-asciiオプションを使うことです

~ curl http://w3.org/ -d "hello=there" --trace-ascii /dev/stdout
== Info: About to connect() to w3.org port 80 (#0)
== Info:   Trying 128.30.52.45... == Info: connected
== Info: Connected to w3.org (128.30.52.45) port 80 (#0)
=> Send header, 210 bytes (0xd2)
0000: POST / HTTP/1.1
0011: User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.1
0051: 9.7 OpenSSL/0.9.8l zlib/1.2.3
0070: Host: w3.org
007e: Accept: */*
008b: Content-Length: 11
009f: Content-Type: application/x-www-form-urlencoded
00d0:
=> Send data, 11 bytes (0xb)
0000: hello=there

残念ながら、multipart/form-dataを投稿しているときには使えません

~ curl http://w3.org/ -F hello=there -F testing=123 --trace-ascii /dev/stdout
== Info: About to connect() to w3.org port 80 (#0)
== Info:   Trying 128.30.52.45... == Info: connected
== Info: Connected to w3.org (128.30.52.45) port 80 (#0)
=> Send header, 270 bytes (0x10e)
0000: POST / HTTP/1.1
0011: User-Agent: curl/7.19.7 (universal-apple-darwin10.0) libcurl/7.1
0051: 9.7 OpenSSL/0.9.8l zlib/1.2.3
0070: Host: w3.org
007e: Accept: */*
008b: Content-Length: 244
00a0: Expect: 100-continue
00b6: Content-Type: multipart/form-data; boundary=--------------------
00f6: --------19319e4d1b79
010c:
<= Recv header, 32 bytes (0x20)
0000: HTTP/1.1 301 Moved Permanently

200  gak  2011-06-01


または、https://httpbin.org/でテストすることもできます

$ curl https://httpbin.org/post -d "firstname=john&lastname=doe"
{
"args": {},
"data": "",
"files": {},
"form": {
"firstname": "john",
"lastname": "doe"
},
"headers": {
"Accept": "*/*",
"Content-Length": "27",
"Content-Type": "application/x-www-form-urlencoded",
"Host": "httpbin.org",
"User-Agent": "curl/7.43.0"
},
"json": null,
"origin": "*.*.*.*",
"url": "https://httpbin.org/post"
}

40  Christophe Morio  2016-09-30


netcatの代替を追加したいと思います

#!/bin/bash
nc -l 8080 &

curl "http://localhost:8080" \
-H "Accept: application/json" \
-H "Content-Type: application/json" \
--data @<(cat <<EOF
{
"me": "$USER",
"something": $(date +%s)
}
EOF
)

18  Gert Cuykens  2017-05-21


Charlescurl --proxy localhost:8888を使うといいでしょう。簡単です

9  Dori  2014-08-28


--trace - は curl 7.58 で動作し、POST ボディを表示します

$ curl --trace - -d 'foo=bar' http://example.org
== Info: Rebuilt URL to: http://example.org/
== Info:   Trying 2606:2800:220:1:248:1893:25c8:1946...
== Info: TCP_NODELAY set
== Info: Connected to example.org (2606:2800:220:1:248:1893:25c8:1946) port 80 (#0)
=> Send header, 144 bytes (0x90)
0000: 50 4f 53 54 20 2f 20 48 54 54 50 2f 31 2e 31 0d POST / HTTP/1.1.
0010: 0a 48 6f 73 74 3a 20 65 78 61 6d 70 6c 65 2e 6f .Host: example.o
0020: 72 67 0d 0a 55 73 65 72 2d 41 67 65 6e 74 3a 20 rg..User-Agent:
0030: 63 75 72 6c 2f 37 2e 35 38 2e 30 0d 0a 41 63 63 curl/7.58.0..Acc
0040: 65 70 74 3a 20 2a 2f 2a 0d 0a 43 6f 6e 74 65 6e ept: */*..Conten
0050: 74 2d 4c 65 6e 67 74 68 3a 20 37 0d 0a 43 6f 6e t-Length: 7..Con
0060: 74 65 6e 74 2d 54 79 70 65 3a 20 61 70 70 6c 69 tent-Type: appli
0070: 63 61 74 69 6f 6e 2f 78 2d 77 77 77 2d 66 6f 72 cation/x-www-for
0080: 6d 2d 75 72 6c 65 6e 63 6f 64 65 64 0d 0a 0d 0a m-urlencoded....
=> Send data, 7 bytes (0x7)
0000: 66 6f 6f 3d 62 61 72                            foo=bar
== Info: upload completely sent off: 7 out of 7 bytes
<= Recv header, 17 bytes (0x11)
0000: 48 54 54 50 2f 31 2e 31 20 32 30 30 20 4f 4b 0d HTTP/1.1 200 OK.
0010: 0a                                              .
<= Recv header, 22 bytes (0x16)

0  cweiske  2020-10-14


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