I am working on microservices with Spring Cloud and Netflix OSS Eureka and Ribbon. I have another service running as oauth-server which provides OAuth2 token. All my microservices are registered with Eureka including oauth-server.
My whole solution works if I use hardcoded url of oauth-server as "clientCredentialsResourceDetails.setAccessTokenUri("http://localhost:9000/oauth/token");"
but when I try to use Eureka Discovered url of oauth-server like "clientCredentialsResourceDetails.setAccessTokenUri("http://oauth-server/oauth/token");" I get error:
java.net.UnknownHostException: oauth-server
MyConfig.java
#Bean(name = "myOauth2RestTemplate")
#LoadBalanced
public OAuth2RestOperations restTemplate(RestTemplateCustomizer customizer,
ClientCredentialsResourceDetails resourceDetails) {
OAuth2RestTemplate restTemplate = new OAuth2RestTemplate(resourceDetails);
ClientCredentialsAccessTokenProvider provider = new ClientCredentialsAccessTokenProvider();
restTemplate.setAccessTokenProvider(provider);
customizer.customize(restTemplate);
return restTemplate;
}
#Bean
public ClientCredentialsResourceDetails resourceDetails() {
ClientCredentialsResourceDetails clientCredentialsResourceDetails = new ClientCredentialsResourceDetails();
clientCredentialsResourceDetails.setAccessTokenUri("http://oauth-server/oauth/token");
clientCredentialsResourceDetails.setId("1");
clientCredentialsResourceDetails.setClientId("candy");
clientCredentialsResourceDetails.setClientSecret("123");
clientCredentialsResourceDetails.setScope(Arrays.asList("read", "write"));
clientCredentialsResourceDetails.setGrantType("client_credentials");
return clientCredentialsResourceDetails;
}
MyController.java
#Autowired
#Qualifier("myOauth2RestTemplate")
#LoadBalanced
private OAuth2RestTemplate myOauth2RestTemplate;
#GetMapping("/secure/hello")
public String getSecureData() {
String result = myOauth2RestTemplate.getForObject("http://securems/secure/hello", String.class);
return result;
}
I have searched through a lot of documentation and online help, but those solutions didn't work.
I thought this should have been an easy configuration issue has now eaten up my two days of effort.
I was finally able to make it work with following code:
#Bean
#LoadBalanced
public OAuth2RestTemplate restTemplate(SpringClientFactory clientFactory) {
OAuth2RestTemplate restTemplate = new OAuth2RestTemplate(resourceDetails());
RibbonLoadBalancerClient ribbonLoadBalancerClient = new RibbonLoadBalancerClient(clientFactory);
LoadBalancerInterceptor loadBalancerInterceptor = new LoadBalancerInterceptor(ribbonLoadBalancerClient);
ClientCredentialsAccessTokenProvider accessTokenProvider = new ClientCredentialsAccessTokenProvider();
accessTokenProvider.setInterceptors(Arrays.asList(loadBalancerInterceptor));
restTemplate.setAccessTokenProvider(accessTokenProvider);
return restTemplate;
}
I am going through a code that configures dedicated restTemplate for a rest operation. I see the following properties
httpProperties.connection-request-timeout=6100
httpProperties.connect-timeout=6100
httpProperties.read-timeout=6100
My Config class looks like below
#Bean
#ConfigurationProperties(prefix = "httpProperties")
public HttpComponentsClientHttpRequestFactory webSystemHttpRequestFactory() {
SSLContext sslContext;
try {
SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(sslContext);
HttpClient httpClient = HttpClients.custom().setMaxConnTotal(maxTotalConnection)
.setMaxConnPerRoute(maxConnectionPerRoute).setSSLSocketFactory(socketFactory).build();
return new HttpComponentsClientHttpRequestFactory(httpClient);
}
catch(Exception e) {
}
return new HttpComponentsClientHttpRequestFactory();
}
#Bean(name = "webSystemRestTemplate")
public RestTemplate webSystemRestTemplate() {
RestTemplate restTemplate = new RestTemplate(webSystemHttpRequestFactory());
return restTemplate;
}
I can see the logs
o.a.h.i.c.DefaultManagedHttpClientConnection.setSocketTimeout - http-outgoing-1: set socket timeout to 6100
Here is what i want to understand:
How is this value set and to which property by the #CnfigurationProperties annotation?
Is it applicable at the spring boot application level or at each request level?
Please help me understand the concept underlying.
Note: Apache http client version used is 4.5.2
In the source code for HttpComponentsClientHttpRequestFactory.class there is an object called RequestConfig.class.
In it's source code you can see that there are three parameters.
private final Timeout connectionRequestTimeout;
private final Timeout connectTimeout;
private final Timeout responseTimeout;
These are the ones that the parameters map to using
#ConfigurationProperties(prefix = "httpProperties")
That is not the most common way to set these parameters. But there are multiple ways to set these as pointed out here.
RestTemplate timeout examples
The properties are setting the attributes connectionRequestTimeOut, connectTimeOut and readTimeOut of the HttpComponentsClientHttpRequestFactory class. The mapping is done using the ConfigurationProperties annotation that maps the kebab case property names to the bean attributes.
HttpComponentsClientHttpRequestFactory documentation :
HttpComponentsClientHttpRequestFactory
I have a Spring Boot Microservice where I am trying to invoke an external server which exposes an HTTPS REST Endpoint (TLS v1.2). I have been provided the server side certificate in .pem format.
I would like to implement this call using RestTemplate and use the provided certificate and verify the host name during the call.
I have tried to Google this and all the search results are trying to ignore the certificate and host name.
Can I have an example code snippet to implement this properly?
After some digging with different blogs and stackoverflow threads, following worked for me:
Create Rest Template:
KeyStore keyStore = KeyStore.getInstance("PKCS12");
keyStore.load(new FileInputStream(ResourceUtils.getFile(clientKeyPath)), "".toCharArray());
SSLContext sslContext = SSLContextBuilder
.create()
.loadKeyMaterial(keyStore, null)
.loadTrustMaterial(ResourceUtils.getFile(keystorePath), keystorePassword.toCharArray())
.build();
SSLConnectionSocketFactory sslConnectionSocketFactory = new SSLConnectionSocketFactory(sslContext, new CustomHostnameVerifier());
HttpClient client = HttpClients
.custom()
.setSSLSocketFactory(sslConnectionSocketFactory)
.build();
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setHttpClient(client);
RestTemplate sslRestTemplate = new RestTemplate(requestFactory);
Implementation of CustomHostnameVerifier:
#Component
public class CustomHostnameVerifier implements HostnameVerifier {
#Value("${dns.name}")
private String dnsName;
#Override
public boolean verify(String hostname, SSLSession session) {
return hostname.equals(dnsName);
}
}
I have an application that makes use of multiple rest clients. Each of those REST clients use the same Spring REST template bean. I was wondering if there was a way to set the timeout value per request using the Spring rest template?
This worked for me...
RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
private ClientHttpRequestFactory getClientHttpRequestFactory() {
int timeout = 5000;
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory
= new HttpComponentsClientHttpRequestFactory();
clientHttpRequestFactory.setConnectTimeout(timeout);
return clientHttpRequestFactory;
}
To achieve calling rest template with timeout, first you should create config class also use with #Bean annotation, then implement in class and call with RestTemplateConfig.
#Configuration
public class RestTemplateConfig {
#Bean
public RestTemplate restTemplate() {
return new RestTemplate(clientHttpRequestFactory());
}
private ClientHttpRequestFactory clientHttpRequestFactory() {
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory = new HttpComponentsClientHttpRequestFactory();
clientHttpRequestFactory.setConnectionRequestTimeout(4000);
clientHttpRequestFactory.setReadTimeout(4000);
clientHttpRequestFactory.setConnectTimeout(4000);
return clientHttpRequestFactory;
}
}
But I suggest you use Apache HttpClient, you can manage the connection pool, keep-alive, idle monitor and also create custom error handler. You can check the link: https://springframework.guru/using-resttemplate-with-apaches-httpclient/
You can also modify the SimpleClientHttpRequestFactory.
RestTemplate restTemplate = new RestTemplate();
restTemplate.setRequestFactory(customHttpRequestFactory());
private SimpleClientHttpRequestFactory customHttpRequestFactory() {
SimpleClientHttpRequestFactory simpleClientHttpRequestFactory = new SimpleClientHttpRequestFactory();
simpleClientHttpRequestFactory.setReadTimeout(2000);
simpleClientHttpRequestFactory.setConnectTimeout(2000);
return simpleClientHttpRequestFactory;
}
I would like to set the connection timeouts for a rest service used by my web application. I'm using Spring's RestTemplate to talk to my service. I've done some research and I've found and used the xml below (in my application xml) which I believe is meant to set the timeout. I'm using Spring 3.0.
I've also seen the same problem here Timeout configuration for spring webservices with RestTemplate but the solutions don't seem that clean, I'd prefer to set the timeout values via Spring config
<bean id="RestOperations" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.CommonsClientHttpRequestFactory">
<property name="readTimeout" value="${restURL.connectionTimeout}" />
</bean>
</constructor-arg>
</bean>
It seems whatever I set the readTimeout to be I get the following:
Network cable disconnected:
Waits about 20 seconds and reports following exception:
org.springframework.web.client.ResourceAccessException: I/O error: No route to host: connect; nested exception is java.net.NoRouteToHostException: No route to host: connect
Url incorrect so 404 returned by rest service:
Waits about 10 seconds and reports following exception:
org.springframework.web.client.HttpClientErrorException: 404 Not Found
My requirements require shorter timeouts so I need to be able to change these. Any ideas as to what I'm doing wrong?
Many thanks.
For Spring Boot >= 1.4
#Configuration
public class AppConfig
{
#Bean
public RestTemplate restTemplate(RestTemplateBuilder restTemplateBuilder)
{
return restTemplateBuilder
.setConnectTimeout(...)
.setReadTimeout(...)
.build();
}
}
For Spring Boot <= 1.3
#Configuration
public class AppConfig
{
#Bean
#ConfigurationProperties(prefix = "custom.rest.connection")
public HttpComponentsClientHttpRequestFactory customHttpRequestFactory()
{
return new HttpComponentsClientHttpRequestFactory();
}
#Bean
public RestTemplate customRestTemplate()
{
return new RestTemplate(customHttpRequestFactory());
}
}
then in your application.properties
custom.rest.connection.connection-request-timeout=...
custom.rest.connection.connect-timeout=...
custom.rest.connection.read-timeout=...
This works because HttpComponentsClientHttpRequestFactory has public setters connectionRequestTimeout, connectTimeout, and readTimeout and #ConfigurationProperties sets them for you.
For Spring 4.1 or Spring 5 without Spring Boot using #Configuration instead of XML
#Configuration
public class AppConfig
{
#Bean
public RestTemplate customRestTemplate()
{
HttpComponentsClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory();
httpRequestFactory.setConnectionRequestTimeout(...);
httpRequestFactory.setConnectTimeout(...);
httpRequestFactory.setReadTimeout(...);
return new RestTemplate(httpRequestFactory);
}
}
I finally got this working.
I think the fact that our project had two different versions of the commons-httpclient jar wasn't helping. Once I sorted that out I found you can do two things...
In code you can put the following:
HttpComponentsClientHttpRequestFactory rf =
(HttpComponentsClientHttpRequestFactory) restTemplate.getRequestFactory();
rf.setReadTimeout(1 * 1000);
rf.setConnectTimeout(1 * 1000);
The first time this code is called it will set the timeout for the HttpComponentsClientHttpRequestFactory class used by the RestTemplate. Therefore, all subsequent calls made by RestTemplate will use the timeout settings defined above.
Or the better option is to do this:
<bean id="RestOperations" class="org.springframework.web.client.RestTemplate">
<constructor-arg>
<bean class="org.springframework.http.client.HttpComponentsClientHttpRequestFactory">
<property name="readTimeout" value="${application.urlReadTimeout}" />
<property name="connectTimeout" value="${application.urlConnectionTimeout}" />
</bean>
</constructor-arg>
</bean>
Where I use the RestOperations interface in my code and get the timeout values from a properties file.
This question is the first link for a Spring Boot search, therefore, would be great to put here the solution recommended in the official documentation. Spring Boot has its own convenience bean RestTemplateBuilder:
#Bean
public RestTemplate restTemplate(
RestTemplateBuilder restTemplateBuilder) {
return restTemplateBuilder
.setConnectTimeout(Duration.ofSeconds(500))
.setReadTimeout(Duration.ofSeconds(500))
.build();
}
Manual creation of RestTemplate instances is a potentially troublesome approach because other auto-configured beans are not being injected in manually created instances.
Here are my 2 cents. Nothing new, but some explanations, improvements and newer code.
By default, RestTemplate has infinite timeout.
There are two kinds of timeouts: connection timeout and read time out. For instance, I could connect to the server but I could not read data. The application was hanging and you have no clue what's going on.
I am going to use annotations, which these days are preferred over XML.
#Configuration
public class AppConfig {
#Bean
public RestTemplate restTemplate() {
var factory = new SimpleClientHttpRequestFactory();
factory.setConnectTimeout(3000);
factory.setReadTimeout(3000);
return new RestTemplate(factory);
}
}
Here we use SimpleClientHttpRequestFactory to set the connection and read time outs.
It is then passed to the constructor of RestTemplate.
#Configuration
public class AppConfig {
#Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
return builder
.setConnectTimeout(Duration.ofMillis(3000))
.setReadTimeout(Duration.ofMillis(3000))
.build();
}
}
In the second solution, we use the RestTemplateBuilder. Also notice the parameters of the two methods: they take Duration. The overloaded methods that take directly milliseconds are now deprecated.
Edit
Tested with Spring Boot 2.1.0 and Java 11.
Here is a really simple way to set the timeout:
RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
private ClientHttpRequestFactory getClientHttpRequestFactory() {
int timeout = 5000;
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory =
new HttpComponentsClientHttpRequestFactory();
clientHttpRequestFactory.setConnectTimeout(timeout);
return clientHttpRequestFactory;
}
RestTemplate timeout with SimpleClientHttpRequestFactory
To programmatically override the timeout properties, we can customize the SimpleClientHttpRequestFactory class as below.
Override timeout with SimpleClientHttpRequestFactory
//Create resttemplate
RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
//Override timeouts in request factory
private SimpleClientHttpRequestFactory getClientHttpRequestFactory()
{
SimpleClientHttpRequestFactory clientHttpRequestFactory
= new SimpleClientHttpRequestFactory();
//Connect timeout
clientHttpRequestFactory.setConnectTimeout(10_000);
//Read timeout
clientHttpRequestFactory.setReadTimeout(10_000);
return clientHttpRequestFactory;
}
RestTemplate timeout with HttpComponentsClientHttpRequestFactory
SimpleClientHttpRequestFactory helps in setting timeout but it is very limited in functionality and may not prove sufficient in realtime applications. In production code, we may want to use HttpComponentsClientHttpRequestFactory which support HTTP Client library along with resttemplate.
HTTPClient provides other useful features such as connection pool, idle connection management etc.
Read More : Spring RestTemplate + HttpClient configuration example
Override timeout with HttpComponentsClientHttpRequestFactory
//Create resttemplate
RestTemplate restTemplate = new RestTemplate(getClientHttpRequestFactory());
//Override timeouts in request factory
private SimpleClientHttpRequestFactory getClientHttpRequestFactory()
{
HttpComponentsClientHttpRequestFactory clientHttpRequestFactory
= new HttpComponentsClientHttpRequestFactory();
//Connect timeout
clientHttpRequestFactory.setConnectTimeout(10_000);
//Read timeout
clientHttpRequestFactory.setReadTimeout(10_000);
return clientHttpRequestFactory;
}
reference: Spring RestTemplate timeout configuration example
Simple timeout for restTemplate.I have set the read and write timeout for 3 seconds.
#Bean
public RestTemplate restTemplate(RestTemplateBuilder restTemplateBuilder){
RestTemplate restTemplate= restTemplateBuilder.setConnectTimeout(Duration.ofMillis(3000)).setReadTimeout(Duration.ofMillis(3000)).build();
return restTemplate;
}
I had a similar scenario, but was also required to set a Proxy. The simplest way I could see to do this was to extend the SimpleClientHttpRequestFactory for the ease of setting the proxy (different proxies for non-prod vs prod). This should still work even if you don't require the proxy though. Then in my extended class I override the openConnection(URL url, Proxy proxy) method, using the same as the source, but just setting the timeouts before returning.
#Override
protected HttpURLConnection openConnection(URL url, Proxy proxy) throws IOException {
URLConnection urlConnection = proxy != null ? url.openConnection(proxy) : url.openConnection();
Assert.isInstanceOf(HttpURLConnection.class, urlConnection);
urlConnection.setConnectTimeout(5000);
urlConnection.setReadTimeout(5000);
return (HttpURLConnection) urlConnection;
}
To expand on benscabbia's answer:
private RestTemplate restCaller = new RestTemplate(getClientHttpRequestFactory());
private ClientHttpRequestFactory getClientHttpRequestFactory() {
int connectionTimeout = 5000; // milliseconds
int socketTimeout = 10000; // milliseconds
RequestConfig config = RequestConfig.custom()
.setConnectTimeout(connectionTimeout)
.setConnectionRequestTimeout(connectionTimeout)
.setSocketTimeout(socketTimeout)
.build();
CloseableHttpClient client = HttpClientBuilder
.create()
.setDefaultRequestConfig(config)
.build();
return new HttpComponentsClientHttpRequestFactory(client);
}
private static RestTemplate restTemplate;
static {
HttpComponentsClientHttpRequestFactory rf = new HttpComponentsClientHttpRequestFactory();
rf.setReadTimeout(3 * 1000);
rf.setConnectTimeout(2 * 1000);
restTemplate = new RestTemplate(rf);
restTemplate.getMessageConverters()
.add(0, new StringHttpMessageConverter(StandardCharsets.UTF_8));
}
Setting the timeout only in RestTemplateBuilder didn't work for me when i was using Apache's httpcomponents. I had to set the timeout in the RequestFactory as well.
Here's the entire code:
public RestTemplate templateBuilder() {
RestTemplate restTemplate = this.restTemplateBuilder
.setConnectTimeout(Duration.ofSeconds(connectTimeout))
.setReadTimeout(Duration.ofSeconds(readTimeout))
.build();
HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory();
requestFactory.setConnectTimeout((int) connectTimeout * 1000);
requestFactory.setReadTimeout((int) readTimeout * 1000);
requestFactory.setConnectionRequestTimeout((int) connectTimeout * 1000);
restTemplate.setRequestFactory(new BufferingClientHttpRequestFactory(requestFactory));
return restTemplate;
}