Added option to define custom headers to log requests (#18)

constant.go

@@ -1,6 +1,12 @@
 package coralogix
 
-import "time"
+import (
+	"bufio"
+	"net/http"
+	"net/textproto"
+	"strings"
+	"time"
+)
 
 const (
 	// MaxLogBufferSize is maximum log buffer size (default=128MiB)
@@ -49,4 +55,16 @@ var (
 
 	// TimeDeltaURL is the Coralogix time delay url endpoint
 	TimeDeltaURL string = GetEnv("CORALOGIX_TIME_DELTA_URL", "https://api.coralogix.com:443/sdk/v1/time")
+
+	// Headers is the list of headers added to each send logs request
+	Headers http.Header = func() http.Header {
+		headers := GetEnv("CORALOGIX_HEADERS", "")
+		tp := textproto.NewReader(bufio.NewReader(strings.NewReader(headers)))
+		mimeHeader, err := tp.ReadMIMEHeader()
+		if err != nil {
+			mimeHeader = map[string][]string{}
+		}
+		mimeHeader.Set("Content-Type", "application/json")
+		return http.Header(mimeHeader)
+	}()
 )

http.go

@@ -2,7 +2,7 @@ package coralogix
 
 import (
 	"bytes"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"strconv"
 	"time"
@@ -17,8 +17,14 @@ func SendRequest(Bulk *Bulk) int {
 	for Attempt := 1; uint(Attempt) <= HTTPSendRetryCount; Attempt++ {
 		DebugLogger.Println("About to send bulk to Coralogix server. Attempt number:", Attempt)
 
-		response, err := client.Post(LogURL, "application/json", bytes.NewBuffer(Bulk.ToJSON()))
+		request, err := http.NewRequest("POST", LogURL, bytes.NewBuffer(Bulk.ToJSON()))
+		if err != nil {
+			DebugLogger.Println("Can't create HTTP request:", err)
+			continue
+		}
+		request.Header = Headers
 
+		response, err := client.Do(request)
 		if err != nil {
 			DebugLogger.Println("Can't execute HTTP request:", err)
 			continue
@@ -53,7 +59,7 @@ func GetTimeSync() (bool, float64) {
 	}
 
 	if response.StatusCode == 200 {
-		response, _ := ioutil.ReadAll(response.Body)
+		response, _ := io.ReadAll(response.Body)
 		ServerTime, err := strconv.ParseFloat(string(response), 64)
 
 		if err != nil {