Making a http POST request using Arduino

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I am trying to post information to an API on a web project that I have created and hosted. I am not sure what the exact format is for the HTTP POST request. Every time I try I get HTTP 400 errors with the message that there is "an invalid verb".

Sample Code:

byte server[] = {"our IP"}
..
..

client(server, 80)
..
..
client.println("POST /Api/AddParking/3");

It connects to the IP address supplied without any problems, but all I get back in the above mentioned HTTP error code 400. I am not sure if I was supposed to include a HTTP version after my POST or and Content-Length or any other information.


The original question is already answered, but just for reference for people passing by via Google; here is a more complete example how to post data to a webserver with an Arduino:

IPAddress server(10,0,0,138);
String PostData = "someDataToPost";

if (client.connect(server, 80)) {
  client.println("POST /Api/AddParking/3 HTTP/1.1");
  client.println("Host: 10.0.0.138");
  client.println("User-Agent: Arduino/1.0");
  client.println("Connection: close");
  client.print("Content-Length: ");
  client.println(PostData.length());
  client.println();
  client.println(PostData);
}

working HTTP POST example, This example builds and sends a POST request to my server every .5 requests make it to the server, because the timestamps of my data in  In the Arduino IDE serial monitor, you should see an HTTP response code of 200 (this means that the request has succeeded). Your ThingSpeak Dashboard should be receiving new random readings every 10 seconds. For a final application, you might need to increase the timer or check the API call limits per hour/minute to avoid getting blocked/banned.


Sending hand-crafted HTTP packets can be a bit tricky because they are extremely picky about the format used. I highly recommend reading through the HTTP protocol if you have the time because it explains the syntax and fields required. In particular you should look at section 5 "Request".

With regards to your code, you do need to specify the HTTP version after the POST URI and I believe you also need to specify the "Host" header. On top of that you need to be sure to have a carriage-return line-feed (CRLF) at the end of each line. So, your packet should look something like:

POST /Api/AddParking/3 HTTP/1.1
Host: www.yourhost.com

How to add string to HTTP POST request, I would like to add a string to my HTTP POST request. I want the string to be based off So If I type in the number 5 in the serial monitor it will then send the request http. You need to make some changes to your code. For a  3. ESP32 HTTP POST: URL Encoded, JSON Data Object, Plain Text. Finally, you’ll learn how to make an HTTP POST request with an ESP32. With this example, your ESP32 can make HTTP POST requests using three different types of body requests: URL encoded, JSON object or plain text.


Requests can be sent like that too

 // Check if we are Connected.
 if(WiFi.status()== WL_CONNECTED){   //Check WiFi connection status
    HTTPClient http;    //Declare object of class HTTPClient

    http.begin("http://useotools.com/");      //Specify request destination
    http.addHeader("Content-Type", "application/x-www-form-urlencoded", false, true);
    int httpCode = http.POST("type=get_desire_data&"); //Send the request

    Serial.println(httpCode);   //Print HTTP return code
    http.writeToStream(&Serial);  // Print the response body

}

Making a http POST request using Arduino, The original question is already answered, but just for reference for people passing by via Google; here is a more complete example how to  You know the secret now 😉. This is all that it takes to make a HTTP POST call using Arduino Uno and ESP8266 WiFi module. One more thing: always turnoff (disconnect) the wifi before uploading code


Another option is using the HTTPClient.h (for the arduino IDE on adafruit's ESP32 feather), which handles https with no effort it seems. I'm including JSON payload also and can successfully send an IFTTT webhook.

  HTTPClient http;
  String url="https://<IPaddress>/testurl";
  String jsondata=(<properly escaped json data here>);

  http.begin(url); 
  http.addHeader("Content-Type", "Content-Type: application/json"); 

  int httpResponseCode = http.POST(jsondata); //Send the actual POST request

  if(httpResponseCode>0){
    String response = http.getString();  //Get the response to the request
    Serial.println(httpResponseCode);   //Print return code
    Serial.println(response);           //Print request answer
  } else {
    Serial.print("Error on sending POST: ");
    Serial.println(httpResponseCode);

    http.end();

 }

How to post HTTP POST requests on my website?, Basically my project is about POST and GET requests both in single code. I am succeeding in sending GET requests from my website. However, I  I need to know how I can make http posts and http get from Arduino MKR1000 ( act as a client) to a local server. I made it on Raspberry pi using python like this: import requests import json


ESP32 Arduino Tutorial: HTTP POST Requests to Bottle application, ESP32 Arduino Tutorial: HTTP POST Requests to Bottle application To do so, we will run the server and make a HTTP request from a tool  I use this simple HTTP Post request to post some values on my API from Arduino using Switch. each time I push the switch it send a different values to API. void switch_led() { bool SwitchReading =


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How to make REST API (HTTP POST) call using Arduino Uno and , The objective of this tutorial is to explain how to make HTTP POST requests using the ESP32 and the Arduino environment support. We will use  Web Client. This example shows you how to make a HTTP request using an Ethernet shield. It returns a Google search for the term "Arduino".The results of this search are viewable as HTML in the Serial Monitor.