I'm unable to make this ESP8266HttpClient sketch work for ESP8266 (NodeMCU 1.0 (ESP-12E Module)). It's the BasicHttpClient example sketch, with just added API details, which I redacted (URL and API key). API credentials isn't the problem, as I can get the results just fine with an ESP32 (with HttpClient library) and also with Postman. This one, however, returns code 400. I suspect the issue is related to adding the headers, as those two lines are the only additions to the example sketch, but I'm not sure where else to put them. Thanks all!
/**
BasicHTTPClient.ino
Created on: 24.05.2015
*/
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESP8266WiFiMulti.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
ESP8266WiFiMulti WiFiMulti;
void setup() {
Serial.begin(115200);
// Serial.setDebugOutput(true);
Serial.println();
Serial.println();
Serial.println();
for (uint8_t t = 4; t > 0; t--) {
Serial.printf("[SETUP] WAIT %d...\n", t);
Serial.flush();
delay(1000);
}
WiFi.mode(WIFI_STA);
WiFiMulti.addAP("SSID", "PASSWORD");
}
void loop() {
// wait for WiFi connection
if ((WiFiMulti.run() == WL_CONNECTED)) {
WiFiClient client;
HTTPClient http;
Serial.print("[HTTP] begin...\n");
if (http.begin(client, "URL")) { // HTTP
http.addHeader("Content-Type", "API_KEY");
http.addHeader("Accept", "application/json");
Serial.print("[HTTP] GET...\n");
// start connection and send HTTP header
int httpCode = http.GET();
// httpCode will be negative on error
if (httpCode > 0) {
// HTTP header has been send and Server response header has been handled
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
// file found at server
if (httpCode == HTTP_CODE_OK || httpCode == HTTP_CODE_MOVED_PERMANENTLY) {
String payload = http.getString();
Serial.println(payload);
}
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end();
} else {
Serial.printf("[HTTP} Unable to connect\n");
}
}
delay(10000);
}