package main

import (
    "net"
    "net/http/fcgi"
)

func main() {
    l, e := net.Listen("tcp", ":9999")
    if e != nil {
        panic(e)
    }
    fcgi.Serve(l, nil)
}

package main

import (
    "net"
)

// beginRequest, requestId=1, contentLength=8, role=1, keepConn=1
var r1 = []byte{1, 1, 0, 1, 0, 8, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0}
// params, requestId=1, contentLength=10, k1Len=50, v1Len=50 (malformed, in fact there are only 10 bytes in total
var r2 = []byte{1, 4, 0, 1, 0, 10, 0, 0, 50, 50, 3, 4, 5, 6, 7, 8, 9, 10}
// end of params
var r3 = []byte{1, 4, 0, 1, 0, 0, 0, 0}

func main() {
    c, e := net.Dial("tcp", "127.0.0.1:9999")
    if e != nil {
        panic(e)
    }
    defer c.Close()
    if _, e := c.Write(r1); e != nil {
        panic(e)
    }
    if _, e := c.Write(r2); e != nil {
        panic(e)
    }
    if _, e := c.Write(r3); e != nil {
        panic(e)
    }
    println("sent")
}

// parseParams reads an encoded []byte into Params.
func (r *request) parseParams() {
    text := r.rawParams
    r.rawParams = nil
    for len(text) > 0 {
        keyLen, n := readSize(text)
        if n == 0 {
            return
        }
        text = text[n:]
        valLen, n := readSize(text)
        if n == 0 {
            return
        }
        text = text[n:]
        key := readString(text, keyLen)
        text = text[keyLen:] // will panic here
        val := readString(text, valLen)
        text = text[valLen:] // and here
        r.params[key] = val
    }
}