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Re: [libmicrohttpd] How to send a binary payload (octet-stream)?

From: silvioprog
Subject: Re: [libmicrohttpd] How to send a binary payload (octet-stream)?
Date: Fri, 5 Jan 2018 11:10:57 -0300

It worked! 😀

Just sharing the test for future references (smallest study code without any function result testing, don't use it in production!):

#include <microhttpd.h>
#include <stdio.h>
#include <string.h>

#define PAGE "<html><body>OK</body></html>"
#define FN "uploaded-stream.bin"

static size_t stofa(const char *fn, const char *s, size_t l, int a) {
FILE *fp;
fp = fopen(fn, (a ? "ab+" : "wb"));
l = fwrite(s, sizeof(char), l, fp);
return l;

static int atc(void *cls, struct MHD_Connection *con, const char *url, const char *verb, const char *ver,
const char *buf, size_t *off, void **p) {
struct MHD_Response *res;
int ret;
if (!*p) {
*p = (void *) 1;
return MHD_YES;
*p = NULL;
if (*off != 0) {
*off -= stofa(FN, buf, *off, access(FN, F_OK) != -1);
return MHD_YES;
res = MHD_create_response_from_buffer(strlen(PAGE), PAGE, MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response(con, MHD_HTTP_OK, res);
return ret;

int main(void) {
struct MHD_Daemon *daemon;
daemon = MHD_start_daemon(MHD_USE_SELECT_INTERNALLY, 9090, NULL, NULL, &atc, NULL, MHD_OPTION_END);
return 0;
$ curl --header "Content-Type:application/octet-stream" --trace-ascii debugdump.txt --data-binary @content.bin http://localhost:9090

$ md5sum content.bin uploaded-stream.bin 
b9c65bf433a37289d848a1f833a6b311  content.bin
b9c65bf433a37289d848a1f833a6b311  uploaded-stream.bin

ps. I know MHD_create_post_processor(), but the test is just receiving a binary stream sent via octet-stream.

On Fri, Jan 5, 2018 at 12:59 AM, silvioprog <address@hidden> wrote:
Oh, I found a good explanation just after sensing my question:

* @param[in,out] upload_data_size set initially to the size of the
* @a upload_data provided; the method must update this
* value to the number of bytes NOT processed;
... it seems I need to load the upload_data on demand. 🤔

I'm going to test it and back with some feedback ...
Silvio Clécio

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