It just extends OAuth2 specifying some things that are relatively ambiguous in OAuth2, to try to make it more interoperable.

For example, Google login uses OpenID Connect (which underneath uses OAuth2).

But Facebook login doesn't support OpenID Connect. It has its own flavor of OAuth2.

### OpenID (not "OpenID Connect") { #openid-not-openid-connect }

```
[2020-01-01 00:00:00] Q10000 scheduled after   0 µs: OkHttp ConnectionPool
[2020-01-01 00:00:00] Q10000 starting              : OkHttp ConnectionPool
[2020-01-01 00:00:00] Q10000 run again after 300 s : OkHttp ConnectionPool
[2020-01-01 00:00:00] Q10000 finished run in   1 ms: OkHttp ConnectionPool
[2020-01-01 00:00:00] Q10001 scheduled after   0 µs: OkHttp squareup.com applyAndAckSettings

          // Mostly 2-byte UTF-8 sequences - "European" text
          return 0x800;
        } else if (userFriendly.matches("(?i)(?:Chinese|Han|Asian|BMP)")) {
          // Mostly 3-byte UTF-8 sequences - "Asian" text
          return Character.MIN_SUPPLEMENTARY_CODE_POINT;
        } else if (userFriendly.matches("(?i)(?:Cuneiform|rare|exotic|supplementary.*)")) {

### Descargar e Instalar/Ejecutar

Fess 14.17 ya está disponible y se puede descargar en la [página de lanzamientos](https://github.com/codelibs/fess/releases "download"). Las descargas están disponibles en 3 formatos: deb, rpm y zip.

Los siguientes comandos muestran cómo usar la descarga en formato zip:

import org.apache.logging.log4j.Logger;
import org.codelibs.fess.app.service.UserService;
import org.codelibs.fess.app.web.base.FessSearchAction;
import org.codelibs.fess.app.web.base.login.LocalUserCredential;
import org.codelibs.fess.app.web.login.LoginAction;
import org.codelibs.fess.mylasta.action.FessUserBean;
import org.lastaflute.web.Execute;
import org.lastaflute.web.response.HtmlResponse;

package cmd

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[rebalNone-0]
	_ = x[rebalStarted-1]
	_ = x[rebalCompleted-2]
	_ = x[rebalStopped-3]
	_ = x[rebalFailed-4]
}

const _rebalStatus_name = "NoneStartedCompletedStoppedFailed"

labels.bad_request=Het verzoek aan de URL is onjuist.
labels.page_not_found_title=Pagina niet gevonden.
labels.check_url=Controleer de URL.
labels.user_name=Gebruikersnaam
labels.login=Inloggen
labels.login.placeholder_username=Gebruikersnaam
labels.login.placeholder_password=Wachtwoord
labels.login.title=Inloggen
labels.index_label=Label
labels.index_lang=Voorkeurstaal
labels.index_sort=Sorteren

After detecting that the credentials are incorrect, return an `HTTPException` with a status code 401 (the same returned when no credentials are provided) and add the header `WWW-Authenticate` to make the browser show the login prompt again:

package cmd

import "strconv"

func _() {
	// An "invalid array index" compiler error signifies that the constant values have changed.
	// Re-run the stringer command to generate them again.
	var x [1]struct{}
	_ = x[authTypeUnknown-0]
	_ = x[authTypeAnonymous-1]
	_ = x[authTypePresigned-2]
	_ = x[authTypePresignedV2-3]
	_ = x[authTypePostPolicy-4]
	_ = x[authTypeStreamingSigned-5]

import org.codelibs.curl.Curl;
import org.codelibs.curl.CurlResponse;
import org.codelibs.fess.app.web.base.login.ActionResponseCredential;
import org.codelibs.fess.app.web.base.login.AzureAdCredential;
import org.codelibs.fess.app.web.base.login.AzureAdCredential.AzureAdUser;
import org.codelibs.fess.app.web.base.login.FessLoginAssist.LoginCredentialResolver;
import org.codelibs.fess.crawler.Constants;