Unlike router behavior in the Common Runtime with web dynos, the router in Private Spaces does not forward any connections of HTTP requests from one web dyno to another if a connection is refused or timed out. The router in Private Spaces receives outbound HTTP requests over a set of allowed, stable IP addresses. Dyno connection behavior in Private Spacesĭynos in a Private Space run on their own network and routing layer, and communicate to each other over a private network. If all dynos are quarantined, the router will retry for up to 75 seconds (with an incremental back off), before serving an H99 error. A maximum of 10 attempts (or fewer if you don’t have 10 running web dynos) will be made before returning an H19 or H21 error. When a connection to a dyno is refused or times out, the router processing the request will retry the request on another dyno. Because each router keeps its own list of quarantined dynos, other routers may continue to forward connections to the dyno. The quarantine only applies to a single router. If the connection is refused or has not been successfully established after 5 seconds, the dyno will be quarantined and no other connections will be forwarded from that router to the dyno for up to 5 seconds. When Heroku receives an HTTP request, a router establishes a new upstream TCP connection to a randomly selected web dyno that is running in the Common Runtime. Dyno connection behavior on the Common Runtime If the request counter on a particular router fills up, subsequent requests to that router will immediately return an H11 (Backlog too deep) response. The request counter on each router has a maximum size of 200n (n = the number of web dynos your app has running). There is no coordination between routers however, so this request limit is per router. On the Common Runtime, routers limit the number of concurrent requests per app. Request concurrencyĮach router maintains an internal per-app request counter. In cases where there are a large number of dynos, the algorithm may optionally bias its selection towards dynos resident in the same AWS availability zone as the router making the selection. Routers use a random selection algorithm for balancing HTTP requests across web dynos.
HTTP 1.0 compatibility is also maintained.
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The routers are responsible for determining the location of your application’s web dynos and forwarding the HTTP request to one of these dynos.Ī request’s unobfuscated path from the end-client through the Heroku infrastructure to your application allows for full support of HTTP 1.1 features such as chunked responses, long polling, websockets, and using an async webserver to handle multiple responses from a single web process. From here they are passed directly to a set of routers. Inbound requests are received by a load balancer that offers SSL termination. This article provides a detailed reference of how the router behaves, and how it conforms to the HTTP specification. The entry point for all applications on the Common Runtime stack is the domain which offers a direct routing path to your web dynos. The Heroku platform automatically routes HTTP requests sent to your app’s hostname(s) to your web dynos. Available Cipher Suites on the Common Runtime.Dyno connection behavior in Private Spaces.Dyno connection behavior on the Common Runtime.
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