Webserver on Arduino: How to 307 temporary redirect

Question

I originally asked this question. Regarding a webserver Refresh issue on arduino.

I am totally new to web development and ethernet. The answer from @Majenko is correct, but I do not understand how to implement it. Should I change the homepage() function's first line to HTTP/1.1 307 temporary redirect and use META REFRESH?

Or do the homepage() first using HTTP/1.1 200 OK and then for all the following requests, use HTTP/1.1 307 temporary redirect?

• Mohsin Anees: @Majenko I would like you to answer this please.
• Majenko: This might be of use to you: stackoverflow.com/help/merging-accounts

Answer 1

You need to make a decision on what to respond with depending on what the request is you have received.

If you receive a "command" URL (which you already check for by looking for certain sub-strings) then you need to respond with the 307 response. If you don't receive a "command" URL (so anything except the things you are specifically looking for) then you respond with the homepage.

A slight re-formatting of your decision code to use else if instead of just if would make it easier:

if (c == '\n') {
 Serial.println(readString); //print to serial monitor for debuging
 // homepage(); << This is now moved elsewhere.
 //controls the Arduino if you press the buttons
 if (readString.indexOf("?resetcount1") > 0) {
 count1 = 0;
 redirect();
 } else if (readString.indexOf("?resetcount2") > 0) {
 count2 = 0;
 redirect();
 } else if (readString.indexOf("?resetcount3") > 0) {
 count3 = 0;
 redirect();
 } else if (readString.indexOf("?resetcount4") > 0) {
 count4 = 0;
 redirect();
 } else if (readString.indexOf("?togglerelay1") > 0) {
 toggleRelay1();
 redirect();
 } else if (readString.indexOf("?togglerelay2") > 0) {
 toggleRelay2();
 redirect();
 } else if (readString.indexOf("?togglerelay3") > 0) {
 toggleRelay3();
 redirect();
 } else if (readString.indexOf("?togglerelay4") > 0) {
 toggleRelay4();
 redirect();
 } else { // If none of them match then send the homepage.
 homepage();
 }
}

redirect() is as simple as:

void redirect() {
 client.println("HTTP/1.1 307 Temporary Redirect");
 client.println("Location: /");
 client.println("Connection: Close");
 client.println();
 client.stop();
}