diff --git a/src/request-data.cpp b/src/request-data.cpp
index a59b0cd..bdd7c98 100644
--- a/src/request-data.cpp
+++ b/src/request-data.cpp
@@ -276,11 +276,10 @@ struct request_data_handler_response request_data_handler(url_source_request_dat
 							     textStr.c_str());
 
 					// if one of the headers is Content-Type application/json, make sure the text is JSONified
+					std::regex header_regex("content-type",
+								std::regex_constants::icase);
 					for (auto header : request_data->headers) {
 						// check if the header is Content-Type case insensitive using regex
-						std::regex header_regex(
-							"content-type",
-							std::regex_constants::icase);
 						if (std::regex_search(header.first, header_regex) &&
 						    header.second == "application/json") {
 							nlohmann::json tmp = text;
diff --git a/src/ui/RequestBuilder.cpp b/src/ui/RequestBuilder.cpp
index 75d96f9..10e4236 100644
--- a/src/ui/RequestBuilder.cpp
+++ b/src/ui/RequestBuilder.cpp
@@ -148,7 +148,7 @@ RequestBuilder::RequestBuilder(url_source_request_data *request_data,
 		if (index == 1 || index == 2 || index == 3) {
 			//OpenAI
 			ui->methodComboBox->setCurrentIndex(1);
-			addHeaders({{"Content-Type", "application/json "},
+			addHeaders({{"Content-Type", "application/json"},
 				    {"Authorization", "Bearer $OPENAI_API_KEY"}},
 				   ui->tableView_headers);
 		}
@@ -223,7 +223,7 @@ RequestBuilder::RequestBuilder(url_source_request_data *request_data,
 			/* --------------- 11Labs  TTS --------------- */
 			/* ------------------------------------------- */
 			ui->methodComboBox->setCurrentIndex(1);
-			addHeaders({{"Content-Type", "application/json "},
+			addHeaders({{"Content-Type", "application/json"},
 				    {"Accept", "application/json"},
 				    {"xi-api-key", "$XI_API_KEY"}},
 				   ui->tableView_headers);
@@ -254,7 +254,7 @@ RequestBuilder::RequestBuilder(url_source_request_data *request_data,
 			ui->urlLineEdit->setText("https://api-free.deepl.com/v2/translate");
 			addHeaders(
 				{
-					{"Content-Type", "application/json "},
+					{"Content-Type", "application/json"},
 					{"Authorization", "DeepL-Auth-Key $yourAuthKey"},
 				},
 				ui->tableView_headers);