write marshaled string into form data

main.go

@@ -1,10 +1,12 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"log"
+	"mime/multipart"
 	"os"
 	"strconv"
 
@@ -116,6 +118,25 @@ func LoadMatrixData() (string, int, int) {
 	return url, width, height
 }
 
+func CreateInsructions(marshal []byte) (*bytes.Buffer, string) {
+	// Create a new form data object
+	body := &bytes.Buffer{}
+	writer := multipart.NewWriter(body)
+
+	// Add the "instructions" key with the value of marshal
+	part, err := writer.CreateFormField("instructions")
+	if err != nil {
+		log.Fatal(err)
+		return nil, ""
+	}
+	part.Write(marshal)
+
+	// Close the multipart writer
+	writer.Close()
+
+	return body, writer.FormDataContentType()
+}
+
 func SendRequest(client *resty.Client, url string, ins []interface{}) {
 	// Manually marshal instructions
 	marshal, err := json.Marshal(ins)
@@ -127,10 +148,16 @@ func SendRequest(client *resty.Client, url string, ins []interface{}) {
 	// Debug log json data
 	log.Printf("Request: %s\n", string(marshal))
 
+	// Create instructions form data
+	req, content := CreateInsructions(marshal)
+	if req == nil {
+		return
+	}
+
 	// Build and send request
-	resp, err := client.R().
+	res, err := client.R().
-		SetHeader("Content-Type", "application/json").
+		SetHeader("Content-Type", content).
-		SetBody(ins).
+		SetBody(req.Bytes()).
 		Post(fmt.Sprintf("%s/instructions", url))
 
 	// Error handling
@@ -140,11 +167,11 @@ func SendRequest(client *resty.Client, url string, ins []interface{}) {
 	}
 
 	// Print response status
-	log.Printf("Response Status: %s\n", resp.Status())
+	log.Printf("Response Status: %s\n", res.Status())
 
 	// Unmarshal response
 	var data Response
-	err = json.Unmarshal(resp.Body(), &data)
+	err = json.Unmarshal(res.Body(), &data)
 	if err != nil {
 		log.Fatal(err)
 		return