AWS Application Load Balancer会将所有标头转换为小写 [英] AWS Application Load Balancer transforms all headers to lower case

问题描述

我有一个在两个EC2实例中运行的REST API应用程序，并且长期使用AWS Classic Load Balancer。 REST API的客户端依赖于响应标头（例如 Location ）。

I've a REST API application running in two EC2 instance and was using AWS Classic Load Balancer for a long time. The clients of REST API rely on the response headers (e.g. such as Location).

我知道HTTP标头在定义上不区分大小写，但是（不幸的是）一些客户端忽略了此标题，并以区分大小写的方式检查标头（例如，他们期望位置以大写开头）。

I know that HTTP headers are case-insensitive by definition, however (unfortunately) some clients are ignoring this and checking the headers in a case-sensitive way (e.g. they expect Location to start with upper case).

最近我已更改为AWS Application Load Balancer，现在我看到了

Recently I've changed to AWS Application Load Balancer and now I see that it transforms all response headers to lower case, as a result clients are failing to handle the response properly.

我在这里有几个问题。

1. 应用程序负载平衡器的预期行为吗？


2. 是否可以将其配置为按原样返回标头是由应用程序构建的？

推荐答案

这是ALB的预期功能，因为 HTTP / 2小写所有标头和ALB 支持HTTP / 2 。不幸的是，您无法修改ALB处理标头的方式。

It is an expected function of the ALB because HTTP/2 lowercases all headers and ALBs support HTTP/2. Unfortunately you can't modify how the headers are manipulated by the ALB.

更新：请参阅以下注释。我对ALB由于其对HTTP / 2的支持而将小写的请求标头小写的说法可能并不正确。

Update: See the comments below. My statement that the ALB lowercases the request headers due to its support for HTTP/2 may not be accurate.

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