...

for(;;) {
    String resp = client.ExecuteRedirect();

    int end = resp.Find("--myboundary");                            // first in header
    int beg;                                                        // begining of data

    while((beg = resp.Find("\xFF\xD8", end)) != -1) {               // 2 bytes begins... just for little sure
        if((end = resp.Find("\r\n--myboundary", beg)) == -1) {      // '<CL><CR>' after each jpeg
	    break;
        }
				
        String JPEG_data = resp.Mid(beg, end - beg);                                   // <-- here's the jpeg in datas
    }
}

...