Akka-http POST结果为“不支持服务器端HTTP版本". [英] Akka-http POST results in "The server-side HTTP version is not supported"

问题描述

尝试使用akka-http对某些内部端点进行简单的POST请求时遇到问题.执行这段代码后:

I have an issue when trying to do a simple POST request to some internal endpoint using akka-http. When this piece of code is executed:

for {
      request <- Marshal(merchantTransactionRequest).to[RequestEntity]
      response <- Http().singleRequest(
        HttpRequest(
          method = HttpMethods.POST,
          uri = "http://foo/bar:8080",
          entity = request.withContentType(ContentTypes.`application/json`)
        )
      )
      ...
} yield ...

我遇到以下错误:

akka.http.scaladsl.model.IllegalResponseException:不支持服务器端HTTP版本 在akka.http.impl.engine.client.OutgoingConnectionBlueprint $ PrepareResponse $$ anon $ 1.onPush(OutgoingConnectionBlueprint.scala:191) ...

akka.http.scaladsl.model.IllegalResponseException: The server-side HTTP version is not supported at akka.http.impl.engine.client.OutgoingConnectionBlueprint$PrepareResponse$$anon$1.onPush(OutgoingConnectionBlueprint.scala:191) ...

，紧随其后的是以下日志:

which is immediately preceded by the following log:

[0] </10.0.0.135:42610->foo:8080> pushing request to connection: POST bar Strict(508 bytes)

作为调试过程的一部分，我使用curl对该端点执行了相同的查询，该查询取得了神奇的成功(并以HTTP/1.1响应).由于HttpRequest(...)默认使用protocol = HttpProtocols.`HTTP/1.1`，因此我怀疑akka-http与该另一个端点之间协商的HTTP版本不正确.

As part of my debugging journey, I executed the same query to the endpoint using curl, which magically succeeded (and responds with HTTP/1.1). Since HttpRequest(...) defaults to using protocol = HttpProtocols.`HTTP/1.1`, it is my suspicion that somehow the HTTP version negotiated between akka-http and this other endpoint is incorrect.

当akka-http执行POST时，是否可以以某种方式强制实施HTTP版本?或其他任何有关为何curl成功执行POST而akka-http无法成功的线索?请注意，问题仅在执行POST时发生，而不在GET时发生.

Is it possible to somehow enforce a HTTP version when akka-http does a POST? Or any other clue as to why curl succeeds doing the POST, while akka-http does not? Note that problem only occurs while doing POST's, not GET's.

推荐答案

事实证明，该问题有一个非常奇怪的解决方案:与其通过地址

It turned out the problem had a very strange solution: Instead of connecting to directly connecting to the other endpoint through address http://foo/bar:8080 (using our internal DNS resolver), we connected indirectly to the endpoint using https://our-domain.com:443. Everything worked as expected in that case. It seems that akka-http is somehow troubled by the absence of a TLD.

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