Merge pull request #170 from Matt-Pesce/http_content_length_fix

Ensure Content-Length is Sent

http/http.go

@@ -234,6 +234,10 @@ func setBody(req *http.Request, body starlark.String, formData *starlark.Dict, f
 			return err
 		}
 		req.Body = ioutil.NopCloser(strings.NewReader(uq))
+		// Specifying the Content-Length ensures that https://go.dev/src/net/http/transfer.go doesnt specify Transfer-Encoding: chunked which is not supported by some endpoints.
+		// This is required when using ioutil.NopCloser method for the request body (see ShouldSendChunkedRequestBody() in the library mentioned above).
+		req.ContentLength = int64(len(uq))
+
 		return nil
 	}
 
@@ -249,6 +253,7 @@ func setBody(req *http.Request, body starlark.String, formData *starlark.Dict, f
 			return err
 		}
 		req.Body = ioutil.NopCloser(bytes.NewBuffer(data))
+		req.ContentLength = int64(len(data))
 	}
 
 	if formData != nil && formData.Len() > 0 {
@@ -279,6 +284,7 @@ func setBody(req *http.Request, body starlark.String, formData *starlark.Dict, f
 		case formEncodingURL, "":
 			contentType = formEncodingURL
 			req.Body = ioutil.NopCloser(strings.NewReader(form.Encode()))
+			req.ContentLength = int64(len(form.Encode()))
 
 		case formEncodingMultipart:
 			var b bytes.Buffer