Re: [go-nuts] Preserving special characters when reading Go POST request body

[Hugh Myrie]

The original Go function is shown below. Initially, a JSON-encoded string 
is sent from the client. The first print function is used to view the 
output after decoding.


func SendClaim(w http.ResponseWriter, r *http.Request) {
    //  strEcho := "Halo"
    servAddr := tcpAddress

    type Resp struct {
        Status string `json:"status"`
        Reply  string `json:"reply"`
    }
    type Claim struct {
        ClaimInfo string `json:"claiminfo"`
    }

    var params Claim

    erx := json.NewDecoder(r.Body).Decode(&params)
    if erx != nil {
        http.Error(w, erx.Error(), http.StatusBadRequest)
        fmt.Println("Error occurs here")
        log.Printf(erx.Error())
        return
    }
    fmt.Printf("Claims: %s \n", params)
    //  policy := params.CardNo //r.FormValue("cardno")
    //  log.Println("policy # ", policy)

    tcpAddr, err := net.ResolveTCPAddr("tcp", servAddr)
    if err != nil {
        println("ResolveTCPAddr failed:", err.Error())
        respondWithError(w, http.StatusBadRequest, err.Error())
        return
    }

    data := params.ClaimInfo
    //  printr := r.FormValue("printer")

    fmt.Println(data)
    conn, err := net.DialTCP("tcp", nil, tcpAddr)
    if err != nil {
        println("Dial failed:", err.Error())
        respondWithError(w, http.StatusBadRequest, err.Error())
        return
    }

    _, err = conn.Write([]byte(data))
    if err != nil {
        println("Write to server failed:", err.Error())
        respondWithError(w, http.StatusBadRequest, err.Error())
        return
    }

    reply := make([]byte, 1024)

    _, err = conn.Read(reply)
    if err != nil {
        println("Write to server failed:", err.Error())
        respondWithError(w, http.StatusBadRequest, err.Error())
        return
    }

    resp := Resp{}
    println("reply from server=", string(reply))
    resp.Status = "response"
    resp.Reply = string(reply)

    respondWithJSON(w, http.StatusOK, resp)

    conn.Close()
}


On Tuesday, July 2, 2024 at 9:28:01 AM UTC-4 Hugh Myrie wrote:

> Copying the result to notepad confirms the missing special characters.. 
>
> I'll try your suggestion.
>
> Thanks.
>
>
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> On Tue, Jul 2, 2024 at 8:33 AM 'Dan Kortschak' via golang-nuts <
> golan...@googlegroups.com> wrote:
>
>> On Mon, 2024-07-01 at 12:03 -0700, Hugh Myrie wrote:
>> > I am trying to preserve special characters (group separators and
>> > field separators) when reading the request body from a POST request.
>> > 
>> > When I do a dumpRequest I am able to see the special characters (Hex
>> > Format, for example: \x1c or \x03). I am sending the data from the
>> > client as text/plain.
>> > 
>> > I have tried sending the data as JSON and using the decoder in Go. I
>> > have also tried using Base64 and decoding in go accordingly. I have
>> > tried json.unmarshal to decode the incoming JSON data. However, in
>> > every instance the special characters are removed.
>> > 
>> > I need the special characters to be preserved so I can send the data
>> > for further processing. I need the special characters not the
>> > hexadecimal representation.
>> > 
>> > I am able to see the actual data being sent to the Go server. I also
>> > tried encoding the data from the client side.
>> > 
>> > Your help would be greatly appreciated.
>>
>> This looks to be working as expected. https://go.dev/play/p/fqLPbsMKaOm
>>
>> How are you seeing the bytes being missing?
>>
>>
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