ESP8266WebServerSecure.serveStatic() and BearSSL failed with "ERR_CONTENT_LENGTH_MISMATCH"

[antiFetzen]

Basic Infos

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

Platform

• Hardware: ESP8266
• Core Version: e486887
• Development Env: Platformio
• Operating System: Windows 10

Settings in IDE

• Module: Wemos D1 mini
• Flash Mode: [qio|dio|other]
• Flash Size: 4MB
• lwip Variant: v1.4
• Reset Method: ck
• Flash Frequency: 40Mhz
• CPU Frequency: 160Mhz
• Upload Using: SERIAL
• Upload Speed: 115200

Problem Description

When using .serveStatic () I always get the error message in the browser "ERR_CONTENT_LENGTH_MISMATCH"
If I use the server.on () function, the file will be sent correctly.

server.on("/", [](){
   File file = SPIFFS.open("/index.html", "r");
   server.streamFile(file, "text/html");
   file.close();
});

I tried to find the cause
ESP8266WebServer.cpp

void ESP8266WebServer::_handleRequest() {
  ...
  handled = _currentHandler->handle(*this, _currentMethod, _currentUri);
  ...
}

RequestHandlersImpl.h

bool handle(ESP8266WebServer& server, HTTPMethod requestMethod, String requestUri) override {
  ...
  if (_cache_header.length() != 0)
    server.sendHeader("Cache-Control", _cache_header);

  server.streamFile(f, contentType);  //<-- this function will be called
  return true;
}

it is called
ESP8266WebServer.h

  template<typename T> 
  size_t streamFile(T &file, const String& contentType) {
    _streamFileCore(file.size(), file.name(), contentType);
    return _currentClient.write(file);
  }

instead of
ESP8266WebServerSecure.h

  template<typename T>
  size_t streamFile(T &file, const String& contentType) {
    _streamFileCore(file.size(), file.name(), contentType);
    return _currentClientSecure.write(file);
  }

The pointer * this should be refer to BearSSL::ESP8266WebServerSecure server (443)?
I think that's it but I do not know how to fix it.

MCVE Sketch

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServerSecure.h>
#include <ESP8266mDNS.h>

#include <ESP8266httpUpdate.h>
#include <FS.h>

const char* ssid = "wifi";
const char* password = "1234";

BearSSL::ESP8266WebServerSecure server(443);
static const char serverCert[] PROGMEM = R"EOF(...)EOF";
static const char serverKey[] PROGMEM =  R"EOF(...)EOF";

void setup() { 
  SPIFFS.begin();
  WiFi.begin(ssid, password);

  server.serveStatic("/", SPIFFS, "/index.html");

  server.begin();
}

void loop() {
  server.handleClient();
}

Debug Messages

New secure client
method: GET url: / search:
headerName: Host
headerValue: littledroid1
headerName: Connection
headerValue: keep-alive
headerName: Cache-Control
headerValue: max-age=0
headerName: Upgrade-Insecure-Requests
headerValue: 1
headerName: User-Agent
headerValue: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36
headerName: Accept
headerValue: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
headerName: Accept-Encoding
headerValue: gzip, deflate, br
headerName: Accept-Language
headerValue: de-DE,de;q=0.9,en-US;q=0.8,en;q=0.7
args:
Request: /
 Arguments:

StaticRequestHandler::handle: request=/ _uri=/
StaticRequestHandler::handle: path=/index.html, isFile=1

[earlephilhower]

Good debugging!

Ah, the joys of templates and non-virtual functions combined with Arduino's love of passing copies of objects instead of references. At first glance your description looks good and there's probably not a simple way to make it work (can't do virtual templates in C++), but we can figure something out.