Box 1: "type": "http"
Box 2: "customHandler": { "description":{
A custom handler is defined by configuring the host.json file with details on how to run the web server via the customHandler section.
The customHandler section points to a target as defined by the defaultExecutablePath.
Example:
"customHandler": {
"description": {
"defaultExecutablePath": "handler.exe"
Box 3: "enableForwardingHttpRequest": false
Incorrect:
For HTTP-triggered functions with no additional bindings or outputs, you may want your handler to work directly with the HTTP request and response instead of the custom handler request and response payloads. This behavior can be configured in host.json using the enableForwardingHttpRequest setting.
At the root of the app, the host.json file is configured to run handler.exe and enableForwardingHttpRequest is set to true.
Reference:
https://docs.microsoft.com/en-us/azure/azure-functions/functions-custom-handlers
