Question

使用toolbox命令创建一个新项目：vapor new projectname

在main.swift文件中，我添加了中间件代码：

import Vapor
import HTTP

final class VersionMiddleware: Middleware {
    func respond(to request: Request, chainingTo next: Responder) throws -> Response {
        let response = try next.respond(to: request)

        response.headers["Version"] = "API v1.0"
        print("not printing")

        return response
    }
}

let drop = Droplet(availableMiddleware: [
    "version": VersionMiddleware()
])

drop.get("hello") {
    req in 
    return "Hello world"
} 

drop.run()

但是当我运行它时，它会打印出＃34; hello world＆＃34;但API版本未添加到标头中。我正在用邮递员检查它。

Answer 1

我认为你应该配置Config/middleware.json

{
"server": [
    ...
    "version"
],
...
}

这将是有效的。

middleware document

Answer 2

Vapor1➙2迁移注意：＆＃34;中间件＆＃34;订购配置已从 Config / middleware.json 移至 Config / droplet.json 。

Vapor 2

在Vapor 2中，可以按如下方式创建，添加和配置中间件：

源/应用/中间件/ ExampleMiddleware.swift

final class ExampleMiddleware: Middleware {
  func respond(to request: Request, chainingTo next: Responder) throws -> Response {
    // if needed, process inbound `request` here.
    // Swift.print(request.description)

    // pass next inbound `request` to next middleware in processing chain
    let response: Response = try next.respond(to: request)

    // if needed, process outbound `response` here
    // Swift.print(response.description)

    // return `response` to chain back up any remaining middleware to client
    return response
  }
}

源/应用/设置/配置+ Setup.swift

extension Config {
  public func setup() throws {
    …
    try setupMiddleware()
    …
  }

  public func setupMiddleware() throws {
    self.addConfigurable(
        middleware: ExampleMiddleware(), 
        name: "example" 
    )     
  }
}

配置/ droplet.json

"middleware": [
    …,
    "example"
],

注意：中间件直接包含在Vapor 2中（例如＆＃34;错误＆＃34;，＆＃34;会话＆＃34;，＆＃34;文件＆＃34;，＆＃34;日期＆＃34;，如果没有Config/droplet.json设置步骤，"middleware" addConfigurable(middleware, name)将使用＆＃34; cors＆＃34;）。

Vapor 2 Docs: Middleware ⇗

如何为steam Web框架编写中间件？

2 个答案: