PUT & DELETE

Demonstrates how to update and delete remote resources using PUT and DELETE methods.

Sources: - examples/PutRequest/PutRequest.ino - examples/DeleteRequest/DeleteRequest.ino

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PUT — Update a Resource

The put() and its alias update() send an HTTP PUT request. The body is constructed the same way as POST, using .body() calls.

// Update post #1 with a new title and body
client.put("/posts/1")
      .body("id", 1)
      .body("title", "updated title")
      .body("body",  "updated body")
      .body("userId", 1);

if (client.getStatusCode() == 200) {
    Serial.println("Resource updated successfully.");
}

Using the update() alias

update() is a semantic alias for put() — both produce the exact same HTTP PUT request:

// These two are identical
client.put("/lights/1").body("state", "OFF");
client.update("/lights/1").body("state", "OFF");

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PATCH — Partial Update

Use patch() for partial resource updates (only the fields you send are changed):

client.patch("/posts/1")
      .body("title", "new title only");

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DELETE — Remove a Resource

The del() method sends an HTTP DELETE request. It can be used without a body:

client.del("/posts/1");

if (client.getStatusCode() == 200) {
    Serial.println("Resource deleted.");
}

DELETE can optionally include a body if the API requires it:

client.del("/sessions")
      .body("userId", 42);

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Full Sketch — PUT then DELETE

#include <Arduino.h>
#include <WiFi.h>
#include "ESP32HTTPClient.h"

const char* ssid     = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";

ESP32HTTPClient client("https://jsonplaceholder.typicode.com");

void setup() {
    Serial.begin(115200);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) delay(500);
    Serial.println("\nWiFi Connected");
}

void loop() {
    // Update
    client.put("/posts/1")
          .body("id",     1)
          .body("title",  "updated title")
          .body("body",   "updated content")
          .body("userId", 1);

    Serial.printf("PUT status : %d\n", client.getStatusCode());

    // Delete
    client.del("/posts/1");
    Serial.printf("DELETE status: %d\n", client.getStatusCode());

    delay(30000);
}

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Expected Serial Output

WiFi Connected
PUT status : 200
DELETE status: 200