ESP32 WifiClientSecure no response - https

Question

I'm working on a project using a google script to publish images from an ESP32-CAM to google drive.
I keep getting the error "no response", no matter how long I set the wait peroid to. I tried using http and https(wificlient and wificlientsecure) but it doesn't work no matter what.
What could be the issue?
WiFiClientSecure clienthttps;
Serial.println("Connect to " + String(myDomain));
if (clienthttps.connect(myDomain, 443)) {
Serial.println("Connection successful");
camera_fb_t * fb = NULL;
fb = esp_camera_fb_get();
if (!fb) {
Serial.println("Camera capture failed");
delay(1000);
ESP.restart();
return;
}
char *input = (char *)fb->buf;
char output[base64_enc_len(3)];
String imageFile = "";
for (int i = 0; i < fb->len; i++) {
base64_encode(output, (input++), 3);
if (i % 3 == 0) imageFile += urlencode(String(output));
}
String Data = myFilename + mimeType + myImage;
esp_camera_fb_return(fb);
Serial.println("Send a captured image to Google Drive.");
Serial.println("POST " + myScript + " HTTP/1.1");
Serial.println("Host: " + String(myDomain));
Serial.println("Content-Length: " + String(Data.length() + imageFile.length()));
Serial.println("Content-Type: application/x-www-form-urlencoded");
Serial.println(Data);
Serial.println();
clienthttps.println("POST " + myScript + " HTTP/1.1");
clienthttps.println("Host: " + String(myDomain));
clienthttps.println("Content-Length: " + String(Data.length() + imageFile.length()));
clienthttps.println("Content-Type: application/x-www-form-urlencoded");
clienthttps.println();
clienthttps.print(Data);
int Index;
for (Index = 0; Index < imageFile.length(); Index = Index + 1000) {
clienthttps.print(imageFile.substring(Index, Index + 1000));
}
Serial.println("Waiting for response.");
long int StartTime = millis();
while (!clienthttps.available()) {
Serial.print(".");
delay(100);
if ((StartTime + waitingTime) < millis()) {
Serial.println();
Serial.println("No response.");
//If you have no response, maybe need a greater value of waitingTime
break;
}
}
Serial.println();
while (clienthttps.available()) {
Serial.print(char(clienthttps.read()));
}
} else {
Serial.println("Connected to " + String(myDomain) + " failed.");
}
clienthttps.stop();

Answer 1

Note that in the latest "github.com/espressif/arduino-esp32" (as at 17Jan23) the command
"WiFiClientSecure.println();" (your "clienthttps.println()") seems to corrupt the SSL-buffer somehow, and although the command returns after a bit, the SSL-connection fails at that point (this didn't happen in earlier versions of the software).
The solution which worked for me was to ensure I at very least sent "WiFiClientSecure.println(" ");" (ie. " \r\n") as this seems to work.
(This solution appears also often necessary if sending data over a GPRS connection because in that instance a ".println()" seems to be ingored!)