[英]What's the syntax of using multiple handlers in Happstack?
Sorry for my basic question, but I'm new to Haskell.抱歉我的基本问题,但我是 Haskell 的新手。
I'm following this example to receive some values from a request body, but my server also serves static files from a directory using the following code:我正在按照此示例从请求正文接收一些值,但我的服务器还使用以下代码从目录中提供静态文件:
fileServing :: ServerPart Response
fileServing = serveDirectory EnableBrowsing ["index.html"] "./Path/"
mainFunc = simpleHTTP nullConf $ msum [
fileServing
]
I added the below code to my library but I'm not sure where to use the handlers
function, because I already have an msum
in the mainFunc
.我将下面的代码添加到我的库中,但我不确定在哪里使用handlers
函数,因为我已经在msum
中有一个mainFunc
。
handlers :: ServerPart Response
handlers =
do decodeBody myPolicy
msum [
myGetData
]
myGetData :: ServerPart Response
myGetData =
do method POST
username <- look "username"
password <- look "password"
ok $ toResponse (username ++ ", " ++ password)
fileServing
, myGetData
, msum [fileServing]
, msum [myGetData]
and handlers
all have ServerPart Response
type, which is the type of what you are passing to simpleHTTP nullConf
in mainFunc
. fileServing
、 myGetData
、 msum [fileServing]
、 msum [myGetData]
和handlers
都具有ServerPart Response
类型,这是您在mainFunc
中传递给simpleHTTP nullConf
的mainFunc
。 That being so, you probably want...既然如此,你可能想要...
mainFunc = simpleHTTP nullConf handlers
-- etc.
handlers :: ServerPart Response
handlers =
do decodeBody myPolicy
msum [ fileServing
, myGetData
]
msum
here combines a list of handlers into a single handler (note that also means msum
on a list with a single handler is redundant). msum
此处将处理程序列表合并为一个处理程序(请注意,这也意味着具有单个处理程序的列表中的msum
是多余的)。
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