HTTP_POST request

[enzosagretti]

Hello!

I am new in esp8266. I am traing to use this library to send from server HTTP_POST request to esp8266, but i cant read parameters(i only can read if i send parameters into url). How can i read parameters from HTTP_POST (parameter in body http request)?

Tanks in advance!

[igrr]

Could you give an example of request you are sending, what are the headers and payload?

[enzosagretti]

I report the bug in #2131.

I am sending by HTTP_POST request:

http://192.168.0.16/1

with payload

val={"val":"prue"}

Source message

POST /1 HTTP/1.1
 HOST: 192.168.0.16
 content-length: 18

 val={"val":"prue"}

The error i think is that in "Parsing.cpp" (line 164) compare

else if (headerName == "Content-Length"

and headerName in this case is content-length

[igrr]

Currently ESP8266WebServer will parse POST request body in three cases:

• for file uploads — appropriate callbacks are called, see FSBrowser sample
• if Content-Type is multipart/form-data — form data is parsed and values are made available as request arguments
• if POST data starts with { or [ and doesn't contain =, it is placed into plain request argument

So even with #2131 fixed your request body will not be parsed into arguments array.
Therefore I suggest to change payload to {"val":"prue"} and get it via server.arg("plain"). Of course you will also need to change content-length to Content-Length in your request until #2131 is fixed.

[enzosagretti]

I think that with #2131 fixed solve it will work fine, because i change case sensitive compare and work for the next example:

HTTP_POST request
http://192.168.0.16/1

HTTP_POST Header

POST /1 HTTP/1.1
 HOST: 192.168.0.16
 accept: application/json
 accept-encoding: gzip, deflate
 accept-language: en-US,en;q=0.8
 content-type: application/json
 user-agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.84 Safari/537.36
 content-length: 18

 val={"val":"prue"}

In the ESP8266 Server side, I parse the request, and return the date payload in Json, and work fine.
ESP8266 return me:

{
"val": "prue"
}

[igrr]

Ah, like that. I haven't figured out that val= part of your payload was to specify the argument name. That will work as well.
Closing the issue as you have figured out the solution :)

[noisemaker00]

I cannot get anything on the server.arg("plain");.
When I perform POST request there's no args.