ESP8266WebServer does't decode POST parameters

Basic Infos

ESP8266WebServer does't decode POST parameters from XMLHttpRequest.

Hardware

Hardware: WeMos Mini
Core Version: lastest from GitHub

Description

ESP8266WebServer does't decode POST parameters.
I use lastest ESP8266WebServer (from yesterday)

Settings in IDE

Module: WeMos D1 R2 & mini
Flash Size: 4MB (3M SPIFFS)
CPU Frequency: 80Mhz
Flash Mode: ? Arduino default
Flash Frequency: ? Arduino default
Upload Using: SERIAL
Reset Method: ?ck / nodemcu?

Sketch

#include <FS.h>
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>

ESP8266WebServer websrv(80);

void setup() {
Serial.begin(115200);
SPIFFS.begin();
WiFi.begin("","**-");
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connected with IP: ");
Serial.println(WiFi.localIP());
websrv.on("/", handleRoot);
websrv.on("/saveconfig", handleSaveConfig);
websrv.begin();
}

void loop() {
websrv.handleClient();
}

void handleRoot() {
File f = SPIFFS.open("/index.html", "r");
size_t sent = websrv.streamFile(f, "text/html");
Serial.println("File /index.html sent");
f.close();
}

void handleSaveConfig() {
Serial.print("Number of args: ");
Serial.println(websrv.args());
Serial.print("Argument(0): ");
Serial.println(websrv.arg(0));
websrv.send(200, "text/html", String(websrv.arg(0)));
}

Debug Messages

pm open,type:2 0
New client
method: POST url: /saveconfig search:
headerName: Host
headerValue: 192.168.254.23
headerName: Connection
headerValue: keep-alive
headerName: Content-Length
headerValue: 25
headerName: Origin
headerValue: http://192.168.254.23
headerName: User-Agent
headerValue: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.108 Safari/537.36
headerName: Content-Type
headerValue: text/plain;charset=UTF-8
headerName: Accept
headerValue: /
headerName: Referer
headerValue: http://192.168.254.23/
headerName: Accept-Encoding
headerValue: gzip, deflate
headerName: Accept-Language
headerValue: cs-CZ,cs;q=0.9,en;q=0.8
args:
Plain: arg1=uno&arg2=two&arg3=77
Request: /saveconfig
Arguments:
Number of args: 1
Argument(0): arg1=uno&arg2=two&arg3=77

files.zip

[Firehed]

Not sure if it's related, but I just ran into a very similar issue (if not the same). My HTTP client was lowercasing the Content-Length header, and as a result this library would fail to parse the POST body correctly.

As a short-term work around I was able to put the POST body as query string parameters, but that's not a real solution.

[devyte]

@scop could you please take a look at this?

[caverna]

another tip would be include HTTP_POST:
websrv.on("/saveconfig", HTTP_POST, handleSaveConfig);

I tried it. Unfortunately, no change.

[scop]

headerName: Content-Type
headerValue: text/plain;charset=UTF-8

No decoding should occur for text/plain POSTs. Try setting Content-Type to application/x-www-form-urlencoded

Yes, it works.
Thank you for your advice