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: [ESP-12|ESP-01|ESP-07|ESP8285 device|other]
• Core Version: [latest git hash or date]
• Development Env: [Arduino IDE|Platformio|Make|other]
• Operating System: [Windows|Ubuntu|MacOS]

Problem Description

Starting from this commit, the streamFile in ESP8266WebServer does only send the first 64 bytes.

See also the findings reported here: letscontrolit/ESPEasy#3561 (comment)

It is sent in my code in this part:
https://github.com/letscontrolit/ESPEasy/blob/e4bd63aff4be231f957b9c910fcc17343e8e91f8/src/src/WebServer/LoadFromFS.cpp#L63-L85

Which does resemble quite a bit how it is described in the examples like this one:

Am I missing something here?
Should I include extra headers, or loop over it to serve what is left?