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libwebsockets/minimal-examples/http-client/minimal-http-client-post
History
Andy Green 127e53cf98 client: multipart mime generation helpers 
lws has been able to generate client multipart mime as shown
in minimal-http-client-post, but it requires a lot of user
boilerplate to handle the boundary, related transaction header,
and multipart headers.

This patch adds a client creation flag to indicate it will
carry multipart mime, which autocreates the boundary string
and applies the transaction header with it, and an api to
form the boundary headers between the different mime parts
and the terminating boundary.
2019-10-12 12:41:14 +01:00
..
CMakeLists.txt clean: internally use LWS_WITH_CLIENT and _SERVER 2019-08-26 09:58:57 +01:00
libwebsockets.org.cer tls certs: update warmcat.com and libwebsockets.org public certs 2019-09-22 03:08:36 -07:00
minimal-http-client-post.c client: multipart mime generation helpers 2019-10-12 12:41:14 +01:00
README.md minimal-http-client-post 2018-04-06 10:38:04 +08:00
selftest.sh client: support pipelining / h2 multi for POST 2018-04-27 07:25:45 +08:00

README.md

lws minimal http client POST

This example demonstrates a multipart POST to

https://libwebsockets.org/testserver/formtest

setting both a form variable and uploading a short file.

The result of the POST form processing is captured and displayed in a hexdump.

This is programmatically POSTing to the same form you can access at

https://libwebsockets.org/testserver

in the "POST" tab with file upload.

By default the client action occurs using http/2 if your lws was built with -DLWS_WITH_HTTP2=1.

build

 $ cmake . && make

usage

 $ ./lws-minimal-http-client-post
[2018/04/03 13:13:10:7891] USER: LWS minimal http client - POST
[2018/04/03 13:13:10:7905] NOTICE: Creating Vhost 'default' (serving disabled), 1 protocols, IPv6 on
[2018/04/03 13:13:10:7984] NOTICE: created client ssl context for default
[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER
[2018/04/03 13:13:12:8444] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
[2018/04/03 13:13:12:8445] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
[2018/04/03 13:13:13:1437] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
[2018/04/03 13:13:13:1440] USER: LWS_CALLBACK_CLIENT_HTTP_WRITEABLE
[2018/04/03 13:13:13:1440] USER: RECEIVE_CLIENT_HTTP_READ: read 402
[2018/04/03 13:13:13:1441] NOTICE: 
[2018/04/03 13:13:13:1441] NOTICE: 0000: 3C 68 74 6D 6C 3E 3C 62 6F 64 79 3E 3C 68 31 3E    <html><body><h1>
[2018/04/03 13:13:13:1441] NOTICE: 0010: 46 6F 72 6D 20 72 65 73 75 6C 74 73 20 28 61 66    Form results (af
[2018/04/03 13:13:13:1441] NOTICE: 0020: 74 65 72 20 75 72 6C 64 65 63 6F 64 69 6E 67 29    ter urldecoding)
[2018/04/03 13:13:13:1441] NOTICE: 0030: 3C 2F 68 31 3E 3C 74 61 62 6C 65 3E 3C 74 72 3E    </h1><table><tr>
[2018/04/03 13:13:13:1441] NOTICE: 0040: 3C 74 64 3E 4E 61 6D 65 3C 2F 74 64 3E 3C 74 64    <td>Name</td><td
[2018/04/03 13:13:13:1441] NOTICE: 0050: 3E 4C 65 6E 67 74 68 3C 2F 74 64 3E 3C 74 64 3E    >Length</td><td>
[2018/04/03 13:13:13:1441] NOTICE: 0060: 56 61 6C 75 65 3C 2F 74 64 3E 3C 2F 74 72 3E 3C    Value</td></tr><
[2018/04/03 13:13:13:1441] NOTICE: 0070: 74 72 3E 3C 74 64 3E 3C 62 3E 74 65 78 74 3C 2F    tr><td><b>text</
[2018/04/03 13:13:13:1441] NOTICE: 0080: 62 3E 3C 2F 74 64 3E 3C 74 64 3E 31 33 3C 2F 74    b></td><td>13</t
[2018/04/03 13:13:13:1441] NOTICE: 0090: 64 3E 3C 74 64 3E 6D 79 20 74 65 78 74 20 66 69    d><td>my text fi
[2018/04/03 13:13:13:1441] NOTICE: 00A0: 65 6C 64 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 74 72    eld</td></tr><tr
[2018/04/03 13:13:13:1441] NOTICE: 00B0: 3E 3C 74 64 3E 3C 62 3E 73 65 6E 64 3C 2F 62 3E    ><td><b>send</b>
[2018/04/03 13:13:13:1441] NOTICE: 00C0: 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F 74 64 3E 3C    </td><td>0</td><
[2018/04/03 13:13:13:1442] NOTICE: 00D0: 74 64 3E 4E 55 4C 4C 3C 2F 74 64 3E 3C 2F 74 72    td>NULL</td></tr
[2018/04/03 13:13:13:1442] NOTICE: 00E0: 3E 3C 74 72 3E 3C 74 64 3E 3C 62 3E 66 69 6C 65    ><tr><td><b>file
[2018/04/03 13:13:13:1442] NOTICE: 00F0: 3C 2F 62 3E 3C 2F 74 64 3E 3C 74 64 3E 30 3C 2F    </b></td><td>0</
[2018/04/03 13:13:13:1442] NOTICE: 0100: 74 64 3E 3C 74 64 3E 4E 55 4C 4C 3C 2F 74 64 3E    td><td>NULL</td>
[2018/04/03 13:13:13:1442] NOTICE: 0110: 3C 2F 74 72 3E 3C 74 72 3E 3C 74 64 3E 3C 62 3E    </tr><tr><td><b>
[2018/04/03 13:13:13:1442] NOTICE: 0120: 75 70 6C 6F 61 64 3C 2F 62 3E 3C 2F 74 64 3E 3C    upload</b></td><
[2018/04/03 13:13:13:1442] NOTICE: 0130: 74 64 3E 30 3C 2F 74 64 3E 3C 74 64 3E 4E 55 4C    td>0</td><td>NUL
[2018/04/03 13:13:13:1442] NOTICE: 0140: 4C 3C 2F 74 64 3E 3C 2F 74 72 3E 3C 2F 74 61 62    L</td></tr></tab
[2018/04/03 13:13:13:1442] NOTICE: 0150: 6C 65 3E 3C 62 72 3E 3C 62 3E 66 69 6C 65 6E 61    le><br><b>filena
[2018/04/03 13:13:13:1442] NOTICE: 0160: 6D 65 3A 3C 2F 62 3E 20 6D 79 66 69 6C 65 2E 74    me:</b> myfile.t
[2018/04/03 13:13:13:1442] NOTICE: 0170: 78 74 2C 20 3C 62 3E 6C 65 6E 67 74 68 3C 2F 62    xt, <b>length</b
[2018/04/03 13:13:13:1442] NOTICE: 0180: 3E 20 34 34 3C 2F 62 6F 64 79 3E 3C 2F 68 74 6D    > 44</body></htm
[2018/04/03 13:13:13:1442] NOTICE: 0190: 6C 3E                                              l>              
[2018/04/03 13:13:13:1442] NOTICE: 
[2018/04/03 13:13:13:1442] USER: LWS_CALLBACK_COMPLETED_CLIENT_HTTP
[2018/04/03 13:13:13:1455] USER: Completed