in spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/UndertowWebServerFactoryDelegate.java [144:176]
Builder createBuilder(AbstractConfigurableWebServerFactory factory) {
Ssl ssl = factory.getSsl();
InetAddress address = factory.getAddress();
int port = factory.getPort();
Builder builder = Undertow.builder();
if (this.bufferSize != null) {
builder.setBufferSize(this.bufferSize);
}
if (this.ioThreads != null) {
builder.setIoThreads(this.ioThreads);
}
if (this.workerThreads != null) {
builder.setWorkerThreads(this.workerThreads);
}
if (this.directBuffers != null) {
builder.setDirectBuffers(this.directBuffers);
}
if (ssl != null && ssl.isEnabled()) {
new SslBuilderCustomizer(factory.getPort(), address, ssl, factory.getSslStoreProvider()).customize(builder);
Http2 http2 = factory.getHttp2();
if (http2 != null) {
builder.setServerOption(UndertowOptions.ENABLE_HTTP2, http2.isEnabled());
}
}
else {
builder.addHttpListener(port, (address != null) ? address.getHostAddress() : "0.0.0.0");
}
builder.setServerOption(UndertowOptions.SHUTDOWN_TIMEOUT, 0);
for (UndertowBuilderCustomizer customizer : this.builderCustomizers) {
customizer.customize(builder);
}
return builder;
}