WiFiClientSecure hangs on Files > 48k bytes

[ZinggJM]

----------------------------- Delete below -----------------------------

----------------------------- Delete above -----------------------------

Basic Infos

• [x ] This issue complies with the issue POLICY doc.
• [x ] I have read the documentation at readthedocs and the issue is not addressed there.
• [x ] I have tested that the issue is present in current master branch (aka latest git).
• [x ] I have searched the issue tracker for a similar issue.
• [x ] If there is a stack dump, I have decoded it.
• [ x] I have filled out all fields below.

Platform

• Hardware: ESP8266 device
• Core Version: 2.4.1
• Development Env: Arduino IDE
• Operating System: Windows

Settings in IDE

• Module: Wemos D1 mini r2
• Flash Mode: ?
• Flash Size: 4MB
• lwip Variant: v2 Lower Memory
• Reset Method: ?
• Flash Frequency: [40Mhz]
• CPU Frequency: 80Mhz
• Upload Using: SERIAL
• Upload Speed: 115200

Problem Description

download from Web-page through WiFiClientSecure hangs for large files

MCVE Sketch

/*
    HTTP over TLS (HTTPS) example sketch

    This example demonstrates how to use
    WiFiClientSecure class to access HTTPS API.
    We fetch and display the status of
    esp8266/Arduino project continuous integration
    build.

    Limitations:
      only RSA certificates
      no support of Perfect Forward Secrecy (PFS)
      TLSv1.2 is supported since version 2.4.0-rc1

    Created by Ivan Grokhotkov, 2015.
    This example is in public domain.
*/

#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>

const char* ssid = "........";
const char* password = "........";

//const char* host = "api.github.com";
const char* host = "raw.githubusercontent.com";
const int httpsPort = 443;

// Use web browser to view and copy
// SHA1 fingerprint of the certificate
//const char* fingerprint = "35 85 74 EF 67 35 A7 CE 40 69 50 F3 C0 F6 80 CF 80 3B 2E 19";
const char* fingerprint     = "cc aa 48 48 66 46 0e 91 53 2c 9c 7c 23 2a b1 74 4d 29 9d 33";

void setup() {
  Serial.begin(115200);
  Serial.println();
  Serial.print("connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  // Use WiFiClientSecure class to create TLS connection
  WiFiClientSecure client;
  Serial.print("connecting to ");
  Serial.println(host);
  if (!client.connect(host, httpsPort)) {
    Serial.println("connection failed");
    return;
  }

  if (client.verify(fingerprint, host)) {
    Serial.println("certificate matches");
  } else {
    Serial.println("certificate doesn't match");
  }

  //String url = "/repos/esp8266/Arduino/commits/master/status";
  //String url = "/prenticedavid/MCUFRIEND_kbv/master/extras/bitmaps/betty_1.bmp"; // works
  String url = "/prenticedavid/MCUFRIEND_kbv/master/extras/bitmaps/test.bmp"; // hangs
  Serial.print("requesting URL: ");
  Serial.println(url);

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "User-Agent: BuildFailureDetectorESP8266\r\n" +
               "Connection: close\r\n\r\n");

  Serial.println("request sent");
  while (client.connected()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") {
      Serial.println("headers received");
      break;
    }
  }
  //  String line = client.readStringUntil('\n');
  //  if (line.startsWith("{\"state\":\"success\"")) {
  //    Serial.println("esp8266/Arduino CI successfull!");
  //  } else {
  //    Serial.println("esp8266/Arduino CI has failed");
  //  }
  //  Serial.println("reply was:");
  //  Serial.println("==========");
  //  Serial.println(line);
  //  Serial.println("==========");
  //  Serial.println("closing connection");
  uint32_t count = 0;
  while (client.connected())
  {
    if (client.available())
    {
      int16_t v = client.read();
      count++;
      if (0 == count % 1000)
      {
        Serial.print("got "); Serial.print(count); Serial.println(" so far...");
        delay(1); // avoid WDT
      }
    }
    else delay(1); // avoid WDT
  // hangs after 48000
  }
  Serial.print("terminated, received "); Serial.println(count);
}

void loop() {
}

Debug Messages

Debug messages go here

[d-a-v]

Your #4814 is already reopened. Thanks for the provided details and MCVE !