I am using an EthernetServer and EthernetClient with Arduino in order to make a simple webpage. I have a web form for a user to enter various codes that can reset data stored on the back end. However, once I enter text into the web form once, it seems to be continually being included in the HTTP header after that. I have the URL: http://192.168.1.30, which becomes (and stays at) http://192.168.1.30/?data=5935 once I enter '5935'. My code is:
void loop() {
// Listen for incoming clients
client = server.available();
if (client) {
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
if(HTTPHeader.length() < 100) {
HTTPHeader += c;
}
// if you've gotten to the end of the line (received a newline
// character) and the line is blank, the http request has ended,
// so you can send a reply
if (c == '\n' && currentLineIsBlank) {
// Calcuate weather parameters for serial and web
calcWeather(); //Go calc all the various sensors
// Send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close"); // the connection will be closed after completion of the response
client.println("Refresh: 5"); // refresh the page automatically every 5 sec
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<br>");
client.println("<BODY BGCOLOR=powderblue>");
client.println("<br>");
client.println("<b>Web Server and Radio Receiver </b>");
client.println("<br>");
client.println("version November 14, 2016");
client.println("<br>");
client.println("</center>");
client.println("<b>INSIDE</b>");
client.println("<br>");
client.print("<b>Temperature (F) = <b><font color=red>");
client.println(templm34);
client.println("</b></font><br />");
client.println("<b>Transmission Errors: </b>");
client.print("<b><font color=red>");
client.print(numberReceived);
client.println("</b></font><br />");
client.println("<b>Transmissions Received : </b>");
client.print("<b><font color=red>");
client.print(numberOfErrors);
client.println("</b></font><br />");
client.println("<b>Transmission Error Rate: </b>");
client.print("<b><font color=red>");
client.print((numberReceived==0)?(0.0):(numberOfErrors/numberReceived));
client.println("%</b></font><br />");
client.println("<br />");
client.println("<br />");
client.println("<br />");
client.println("<br />");
// Display the table of illuminance values
client.println("<table cellpadding=5, border=1>");
client.println("<tr>");
client.println("<th><u>Illuminance</u></th>");
client.println("<th><u>Real World Light Value</u></th>");
client.println("</tr>");
client.println("<tr>");
client.println("<td>0</td>");
client.println("<td>Absolute Dark</td>");
client.println("</tr>");
client.println("<tr>");
client.println("<td>10</td>");
client.println("<td>Night</td>");
client.println("</tr>");
client.println("<tr>");
client.println("<td>100</td>");
client.println("<td>Dark Day</td>");
client.println("</tr>");
client.println("<tr>");
client.println("<td>1000</td>");
client.println("<td>Overcast</td>");
client.println("</tr>");
client.println("</table>");
client.println("<br />");
client.println("<br />");
client.println("<form action='/' method=get>");
client.println("<input type=text name=data maxlength=4>");
client.println("<input type=submit value=Submit>");
client.println("</form>");
client.println("</body>");
client.println("</html>");
break;
}
if (c == '\n') {
// you're starting a new line
currentLineIsBlank = true;
} else if (c != '\r') {
// you've gotten a character on the current line
currentLineIsBlank = false;
}
}
}
}
// give the web browser time to receive the data
delay(1);
client.stop();
if (HTTPHeader.indexOf("5935") > 0) {
resetData();
Serial.print("Found!");
}
HTTPHeader = "";
}
"Found" is printed to the serial every time the page refreshes even though I have not actually pressed the submit button to submit it more than once.
