Calls between openFeign services keep the processing mode of request header information
- 2021-10-11 18:36:59
- OfStack
openFeign inter-service invocation holds request header information processing
1. Pay attention to special circumstances, call between timed tasks or interiors, and do not deal with direct return when there is no request.
2. In the case of GET request and parameters are transmitted in Body, restTemplate does not recognize it, so it is necessary to convert and process it here, and then empty body data
3. If java. io. IOException: too many bytes written exception occurs during the request process, please refer to keeping the request header to cause the request header and content-length not 1
/**
* Solve the problem of missing request header in service call
* @author Great immortal
*
*/
@Component
public class FeignConfiguration implements RequestInterceptor{
private final Logger logger = LoggerFactory.getLogger(getClass());
@Autowired
private ObjectMapper objectMapper;
@Override
public void apply(RequestTemplate template) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
.getRequestAttributes();
// Attention : RequestContextHolder Depend on ThreadLocal, So in hystrix The isolation policy of is THREAD , MQ Consumers, timed task calls feignClient This should be null
if (attributes == null) {
return;
}
HttpServletRequest request = attributes.getRequest();
Enumeration<String> headerNames = request.getHeaderNames();
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
String values = request.getHeader(name);
template.header(name, values);
}
}
logger.info(" Hold the request header ");
//feign Not supported GET Method transmission POJO, json body Turn query
if (template.method().equals("GET") && template.requestBody().asBytes() != null) {
try {
JsonNode jsonNode = objectMapper.readTree(template.requestBody().asBytes());
Request.Body.empty();
Map<String, Collection<String>> queries = new HashMap<>();
buildQuery(jsonNode, "", queries);
template.queries(queries);
} catch (IOException e) {
// Prompt : Handle the exception here according to the practical project situation, and do not extend it here.
e.printStackTrace();
}
}
}
/**
* Transformation
* @param jsonNode
* @param path
* @param queries
*/
private void buildQuery(JsonNode jsonNode, String path, Map<String, Collection<String>> queries) {
// Leaf node
if (!jsonNode.isContainerNode()) {
if (jsonNode.isNull()) {
return;
}
Collection<String> values = queries.get(path);
if (null == values) {
values = new ArrayList<>();
queries.put(path, values);
}
values.add(jsonNode.asText());
return;
}
// Array node
if (jsonNode.isArray()) {
Iterator<JsonNode> it = jsonNode.elements();
while (it.hasNext()) {
buildQuery(it.next(), path, queries);
}
} else {
Iterator<Map.Entry<String, JsonNode>> it;
it = jsonNode.fields();
while (it.hasNext()) {
Map.Entry<String, JsonNode> entry = it.next();
if (StringUtils.hasText(path)) {
buildQuery(entry.getValue(), path + "." + entry.getKey(), queries);
} else {
// Root node
buildQuery(entry.getValue(), entry.getKey(), queries);
}
}
}
}
}Keeping the request header causes the request header to be different from content-length
Request processin g failed; nested exception is feign. RetryableException: too many bytes written
2020-09-08 14:07:14.718 ERROR 16146 --- [io-12000-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processin
g failed; nested exception is feign.RetryableException: too many bytes written executing POST http://pay/wx/create] with root cause
java.io.IOException: too many bytes written
at sun.net.www.protocol.http.HttpURLConnection$StreamingOutputStream.write(HttpURLConnection.java:3574) ~[na:1.8.0_212]
at sun.net.www.protocol.http.HttpURLConnection$StreamingOutputStream.write(HttpURLConnection.java:3565) ~[na:1.8.0_212]
at feign.Client$Default.convertAndSend(Client.java:181) ~[feign-core-10.4.0.jar!/:na]
at feign.Client$Default.execute(Client.java:77) ~[feign-core-10.4.0.jar!/:na]
at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:114) ~[spring-cloud-openfeign-core-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer$1.doWithRetry(RetryableFeignLoadBalancer.java:94) ~[spring-cloud-openfeign-core-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.retry.support.RetryTemplate.doExecute(RetryTemplate.java:287) ~[spring-retry-1.2.5.RELEASE.jar!/:na]
at org.springframework.retry.support.RetryTemplate.execute(RetryTemplate.java:180) ~[spring-retry-1.2.5.RELEASE.jar!/:na]
at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:94) ~[spring-cloud-openfeign-core-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at org.springframework.cloud.openfeign.ribbon.RetryableFeignLoadBalancer.execute(RetryableFeignLoadBalancer.java:54) ~[spring-cloud-openfeign-core-2.1.5.RELEASE.jar!/:2.1.5.RELEASE]
at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:228) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144) ~[rxjava-1.3.8.jar!/:1.3.8]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:180) ~[ribbon-loadbalancer-2.3.0.jar!/:2.3.0]
at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:94) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeConcatMap.call(OnSubscribeConcatMap.java:42) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.Observable.unsafeSubscribe(Observable.java:10327) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber$1.call(OperatorRetryWithPredicate.java:127) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.schedulers.TrampolineScheduler$InnerCurrentThreadScheduler.schedule(TrampolineScheduler.java:52) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OperatorRetryWithPredicate$SourceSubscriber.onNext(OperatorRetryWithPredicate.java:45) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.util.ScalarSynchronousObservable$WeakSingleProducer.request(ScalarSynchronousObservable.java:276) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.Subscriber.setProducer(Subscriber.java:209) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:138) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.util.ScalarSynchronousObservable$JustOnSubscribe.call(ScalarSynchronousObservable.java:129) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48) ~[rxjava-1.3.8.jar!/:1.3.8]
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30) ~[rxjava-1.3.8.jar!/:1.3.8The reason is that body is related to Content-Length
When copying, all headers are copied, which may cause the length of Content-length to be different from that of body. So just judge if it is Content-length and skip it
Solution: Change the replication logic
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
// Skip content-length
if (name.equals("content-length")){
continue;
}
String values = request.getHeader(name);
template.header(name, values);
}