Curl Post File Upload Multipart

I’m working on a REST interface at the moment, and there’s nothing I need more than a quick utility to test out various functions. Fills this role perfectly, but I have run into a strange problem that interferes with form POSTing. Let me explain some of the evidence I’ve collected, as well as tell you a workaround I learned from an IRC conversation. In the end, this comes down to the HTTP 1.1 100 CONTINUE response code, which plays a critical role in HTTP 1.1 POST. Configuration For starters, I’m testing this out with OS X 10.5. Curl -F name=somevalue This means “set the field called ‘name’ to ‘somevalue’ and instead of url encoding it, post it as a multipart MIME message.” Your browser does this any time you upload a file to a website.

And that's it. Navigate to the 'send' script and it will transmit the file sample.jpeg to the accept script. Note that you can include other arguments in the post along with the file. This allows you to authenticate the upload. I'm using pre-shared.

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In my case, my REST API lets me upload PDF files, so curl needs to use multipart instead of url encoding for this purpose. Curl only generates one TCP packet based on this command (even though it should generate multiple) and this is what that one packet looks like. Raabta agent vinod mp3 song download. 10:56 IP osx.57777 > osx.8000: P 1:260(259) ack 1 win 65535 0x0000: 4500 0137 03b9 4000 4006 0000 7f00 0001 E.7.@.@. 0x0010: 7f00 0001 e1b1 1f40 3f35 c1d8 0bb4 4ba7.@?5.K.

0x0020: 8018 ffff ff2b 0000 0101 080a 4026 61c9.+.@&a. 0x0030: 4026 61c9 504f 5354 202f 2048 5454 502f @&a.POST./.HTTP/ 0x0040: 312e 310d 0a55 7365 722d 4167 656e 743a 1.1.User-Agent: 0x0050: 2063 7572 6c2f 372e 3139 2e36 2028 6933.curl/7.19.6.(i3 0x0060: 3836 2d61 7070 6c65 2d64 6172 7769 6e39 86-apple-darwin9 0x0070: 2e37 2e30 2920 6c69 6263 7572 6c2f 372e.7.0).libcurl/7. 0x0080: 3139 2e36 207a 6c69 622f 312e 322e 330d 19.6.zlib/1.2.3. 10:80 IP osx.8000 > osx.57777:. Ack 260 win 65535 0x0000: 4500 0034 cda2 4000 4006 0000 7f00 0001 E.4.@.@. 0x0010: 7f00 0001 1f40 e1b1 0bb4 4ba7 3f35 c2db.@.K.?5. 0x0020: 8010 ffff fe28 0000 0101 080a 4026 61c9.(.@&a.

0x0030: 4026 61c9 @&a. 10:65 IP osx.8000 > osx.57777: P 1:21(20) ack 260 win 65535 0x0000: 4500 0048 1bbf 4000 4006 0000 7f00 0001 E.H.@.@. 0x0010: 7f00 0001 1f40 e1b1 0bb4 4ba7 3f35 c2db.@.K.?5.

0x0020: 8018 ffff fe3c 0000 0101 080a 4026 61c9. $ curl -v -F name=somevalue * About to connect() to 127.0.0.1 port 8000 (#0) * Trying 127.0.0.1. 10:74 IP osx.57803 > osx.8000: P 1:238(237) ack 1 win 65535 >nop,nop,timestamp > 0x0000: 4500 0121 c4b5 4000 4006 0000 7f00 0001 E.!@.@. 0x0010: 7f00 0001 e1cb 1f40 5bb2 5099 2f1c 8bad.@[.P./. 0x0020: 8018 ffff ff15 0000 0101 080a 4026 6d60.@&m` 0x0030: 4026 6d60 504f 5354 202f 2048 5454 502f @&m`POST./.HTTP/ 0x0040: 312e 310d 0a55 7365 722d 4167 656e 743a 1.1.User-Agent: 0x0050: 2063 7572 6c2f 372e 3139 2e36 2028 6933.curl/7.19.6.(i3 0x0060: 3836 2d61 7070 6c65 2d64 6172 7769 6e39 86-apple-darwin9 0x0070: 2e37 2e30 2920 6c69 6263 7572 6c2f 372e.7.0).libcurl/7. 0x0080: 3139 2e36 207a 6c69 622f 312e 322e 330d 19.6.zlib/1.2.3.

0x0090: 0a48 6f73 743a 2031 3237 2e30 2e30 2e31.Host.127.0.0.1 0x00a0: 3a38 3030 300d 0a41 6363 6570 743a 202a:8000.Accept.* 0x00b0: 2f2a 0d0a 436f 6e74 656e 742d 4c65 6e67 /*.Content-Leng 0x00c0: 7468 3a20 3134 380d 0a43 6f6e 7465 6e74 th.148.Content 0x00d0: 2d54 7970 653a 206d 756c 7469 7061 7274 -Type.multipart 0x00e0: 2f66 6f72 6d2d 6461 7461 3b20 626f 756e /form-data.boun 0x00f0: 6461 7279 3d2d 2d2d 2d2d 2d2d 2d2d 2d2d dary=----------- 0x0100: 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d 2d2d ---------------- 0x0110: 2d65 3932 3861 6430 3332 3262 340d 0a0d -e928ad0322b4. 0x0120: 0a The packet is now 238 bytes long, which is exactly right. “Expect: 100-continue” is 20 bytes long, plus 2 bytes for r n (0d0a in hex), which accounts for the packet being 22 bytes shorter than the previous 260 byte packet.

As before, the content length is 148 bytes. As before, the packet goes all the way up to the MIME boundary. As before, the server sends back a TCP ACK of the 238 bytes received, but here’s the difference. Critically, without the Expect header, curl sends the entire payload before the server responds. 10:93 IP osx.8000 > osx.57803:. Ack 238 win 65535 >nop,nop, timestamp > 0x0000: 4500 0034 05cf 4000 4006 0000 7f00 0001 E.4.@.@.