How to parse data from POST request

Question

I have a getter context : HTTP::Server::Context and a login form.
Now I want to parse data from context.request.body to get username and password which user input.

The response's content type: application/x-www-form-urlencoded

I used HTTP::Params try to parse request.body but the result is nil. — , Dec 02 '16 at 21:29
You haven't told us the response's content type, but [here you can see how to parse a JSON response](http://stackoverflow.com/q/32552291/641451). — mgarciaisaia, Dec 02 '16 at 22:07
@mgarciaisaia content type: application/x-www-form-urlencoded — , Dec 02 '16 at 22:11

score 4 · Accepted Answer · answered Dec 02 '16 at 22:42

4

HTTP::Params.parse is what you're looking for:

# Based on the sample code in https://crystal-lang.org/ home
require "http/server"

server = HTTP::Server.new(8080) do |context|
  context.response.content_type = "text/plain"
  if body = context.request.body
    params = HTTP::Params.parse(body)
    context.response.print "Hello #{params["user"]? || "Anonymous"}!"
  else
    context.response.print "You didn't POST any data :("
  end
end

puts "Listening on http://127.0.0.1:8080"
server.listen

answered Dec 02 '16 at 22:42

mgarciaisaia

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Thank you so much. – Dec 02 '16 at 23:03
1

Actually I using crouter for routing, but I try to use HTTP::Params to parse request.body and it generates error: no overload matches 'HTTP::Params.parse' with type. But my mistake is crouter has already a params variable, to get body data, just use params["user"] like you did, don't need to parse data again. – Dec 02 '16 at 23:06
Yeah - one would expect parsing those options is one of the things a framework would do for you. This is the "hands-on" approach - your framework would probably be calling this function. Glad it helped, anyways :) – mgarciaisaia Dec 04 '16 at 04:15
Thanks mgarciaisaia, wish you a nice weekend :) – Dec 04 '16 at 12:00

How to parse data from POST request

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