title: LambdaTest, AI-Powered Cloud-based Test Orchestration Platform
    img: https://fastapi.tiangolo.com/img/sponsors/lambdatest.png
  - url: https://requestly.com/fastapi
    title: All-in-one platform to Test, Mock and Intercept APIs. Built for speed, privacy and offline support.

### CORS preflight requests { #cors-preflight-requests }

These are any `OPTIONS` request with `Origin` and `Access-Control-Request-Method` headers.

In this case the middleware will intercept the incoming request and respond with appropriate CORS headers, and either a `200` or `400` response for informational purposes.

### Simple requests { #simple-requests }

_2025-10-30_

 *  New: Add tags to `Call`, including computable tags. Use this to attach application-specific
    metadata to a `Call` in an `EventListener` or `Interceptor`. The tag can be read in any other
    `EventListener` or `Interceptor`.

    ```kotlin
      override fun intercept(chain: Interceptor.Chain): Response {
        chain.call().tag(MyAnalyticsTag::class) {
          MyAnalyticsTag(...)
        }

- Fixed a spurious `namespace not found` error in default `v1.30+` configurations when using `ValidatingAdmissionPolicy` or `MutatingAdmissionPolicy` to intercept namespaced objects in newly-created namespaces. ([#135359](https://github.com/kubernetes/kubernetes/pull/135359), [@liggitt](https://github.com/liggitt))

 * [okhttp-spring-boot](https://github.com/freefair/okhttp-spring-boot): Spring Boot starters for OkHttp
 * [okhttp-staleiferror-interceptor](https://github.com/PeelTechnologies/okhttp-staleiferror-interceptor/): serve stale responses when the server isn’t reachable.
 * [okhttp-stats](https://github.com/flipkart-incubator/okhttp-stats): Get stats like average network speed.

          TimeoutsToUse.PAST,
          // prefer responding to interrupt over timing out
          isInterruptible(method) ? Outcome.INTERRUPT : Outcome.FAILURE);
      addTests(
          suite,
          method,
          Scenario.UNSATISFIED_AND_INTERRUPTED_BEFORE_WAITING,
          TimeoutsToUse.SMALL,
          isInterruptible(method) ? Outcome.INTERRUPT : Outcome.FAILURE);
      addTests(
          suite,

    "Programming Language :: Python :: 3.11",
    "Programming Language :: Python :: 3.12",
    "Programming Language :: Python :: 3.13",
    "Programming Language :: Python :: 3.14",
    "Topic :: Internet :: WWW/HTTP :: HTTP Servers",
    "Topic :: Internet :: WWW/HTTP",
]
dependencies = [
    "starlette>=0.40.0,<0.51.0",
    "pydantic>=2.7.0",
    "typing-extensions>=4.8.0",
    "annotated-doc>=0.0.2",
]

[project.urls]

      super(
          new Runnable() {
            @Override
            public void run() {
              while (!shutdown.get()) {
                interruptee.interrupt();
                Thread.yield();
              }
            }
          });
      this.shutdown = shutdown;
      start();
    }

                }
            }
        } catch (final InterruptedException e) {
            logger.warn("Interrupted generating thumbnail: id={}, command={}", thumbnailId, cmdList, e);
            Thread.currentThread().interrupt();
        } catch (final Exception e) {
            logger.warn("Failed to generate thumbnail: id={}, command={}", thumbnailId, cmdList, e);
        } finally {
            if (task != null) {

                crawlerThreadGroup.interrupt();
                if (logger.isDebugEnabled()) {
                    logger.debug("Interrupted all crawler threads: sessionId={}, activeCount={}", crawlerContext.sessionId,
                            crawlerThreadGroup.activeCount());
                }
            }
        } catch (final Exception e) {