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HTTPUpdateServer Allow external POSTS (CORS) (#6824)

* HTTPUpdateServer Allow external POSTS (CORS)* Format Updates - POST HTTPUpdateServerCo-authored-by: Joseph Francis <joefran@us.ibm.com>

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Original file line number	Diff line number	Diff line change
`@@ -59,8 +59,24 @@ void ESP8266HTTPUpdateServerTemplate<ServerType>::setup(ESP8266WebServerTemplate`
`59`	`59`	`_server->send_P(200,PSTR("text/html"), serverIndex);`
`60`	`60`	`});`
`61`	`61`
	`62`	`+// handler for the /update form page - preflight options`
	`63`	`+ _server->on(path.c_str(), HTTP_OPTIONS, [&](){`
	`64`	`+ _server->sendHeader("Access-Control-Allow-Headers","*");`
	`65`	`+ _server->sendHeader("Access-Control-Allow-Origin","*");`
	`66`	`+ _server->send(200,F("text/html"),String(F("y")));`
	`67`	`+ },[&](){`
	`68`	`+_authenticated = (_username == emptyString \|\| _password == emptyString \|\| _server->authenticate(_username.c_str(), _password.c_str()));`
	`69`	`+if(!_authenticated){`
	`70`	`+if (_serial_output)`
	`71`	`+ Serial.printf("Unauthenticated Update\n");`
	`72`	`+return;`
	`73`	`+ }`
	`74`	`+ });`
	`75`	`+`
`62`	`76`	`// handler for the /update form POST (once file upload finishes)`
`63`	`77`	`_server->on(path.c_str(), HTTP_POST, [&](){`
	`78`	`+ _server->sendHeader("Access-Control-Allow-Headers","*");`
	`79`	`+ _server->sendHeader("Access-Control-Allow-Origin","*");`
`64`	`80`	`if(!_authenticated)`
`65`	`81`	`return _server->requestAuthentication();`
`66`	`82`	`if (Update.hasError()) {`

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