Yes, you should be able to achieve the specified deep sleep current. An external RTC crystal will increase this, however. I've never used one so I don't know by how much exactly. There's a good chance this is the culprit, at least partially. Yes, ESP-IDF will power down everything possible automatic...

What ammeter are you using? Where exactly are you measuring this current? What power supply are you using? What regulator are you using? What other external peripherals are connected? Can you share a schematic? Do you have external bias resistors on the MOSFET gates? Have you confirmed Vgs is as exp...

You are sending both the content length header and a chunked encoding header. This is not a valid HTTP request. esp_http_client will take care of this for you based on the length you provide to esp_http_client_open (see https://github.com/espressif/esp-idf/blob/8ba96ab87389dd5400b7670a14356ea8620223...

You are writing the file using println, which in Arduino-land will usually append \r\n (https://reference.arduino.cc/reference/ ... l/println/).
When you read it back with readStringUntil('\n'), the resulting string will then include the '\r'.

1&2. Yes, an ESP32 can have a HTTP server to respond to requests from clients, as well as a HTTP client to send requests to servers. They may speak the same language but these are separate functions with different roles. 3. No, but this isn't a concern. Your typical router firewall will block all in...

Another option is a supervisor IC selected to ignore voltage drops of a short duration. TPS3899, for example, has a programmable sense delay using an external capacitor; if the voltage rises above the threshold again before this time expires, it will do nothing.

Not before the response is complete.
Chunked encoding is used when the server doesn't know the total length of its response beforehand. If it knew, it wouldn't need to use chunked encoding (unless it was being a PITA by choice).

No, don't do anything:
You don't need to disable it if you haven't enabled it.

This is nuts. Don't initialise it. There's nothing to stop.

How I told. I want to send an encrypted file to the ESP over html (no https) or the user downloads its himself, like a firmware.bin. The firmware shall nobody use on foreign Hardware. Only my first installed Software has the key. The title is confusing, then. It sounded like you wanted to implement...