diff --git a/librepomgr/webapi/routes_buildaction.cpp b/librepomgr/webapi/routes_buildaction.cpp
index 5af8a52..c12e1b2 100644
--- a/librepomgr/webapi/routes_buildaction.cpp
+++ b/librepomgr/webapi/routes_buildaction.cpp
@@ -122,12 +122,17 @@ static std::string readNameParam(const Params &params, ResponseHandler &&handler
     return nameParams.front();
 }
 
-static void getBuildActionFile(const Params &params, std::vector<std::string> BuildAction::*fileList, ResponseHandler &&handler)
+static void getBuildActionFile(
+    const Params &params, std::vector<std::string> BuildAction::*fileList, ResponseHandler &&handler, bool determineMimeType)
 {
     const auto name = readNameParam(params, std::move(handler));
     if (name.empty()) {
         return;
     }
+    auto mimeType = std::string_view("application/octet-stream");
+    if (determineMimeType) {
+        mimeType = Session::determineMimeType(name, mimeType);
+    }
     auto buildActionsSearchResult = findBuildActions(params, std::move(handler), false, 1);
     if (!buildActionsSearchResult.ok) {
         return;
@@ -136,7 +141,7 @@ static void getBuildActionFile(const Params &params, std::vector<std::string> Bu
     auto &buildAction = buildActionsSearchResult.actions.front();
     for (const auto &logFile : (*buildAction).*fileList) {
         if (name == logFile) {
-            buildAction->streamFile(params, name, "application/octet-stream");
+            buildAction->streamFile(params, name, mimeType);
             return;
         }
     }
@@ -145,12 +150,12 @@ static void getBuildActionFile(const Params &params, std::vector<std::string> Bu
 
 void getBuildActionLogFile(const Params &params, ResponseHandler &&handler)
 {
-    getBuildActionFile(params, &BuildAction::logfiles, std::move(handler));
+    getBuildActionFile(params, &BuildAction::logfiles, std::move(handler), false);
 }
 
 void getBuildActionArtefact(const Params &params, ResponseHandler &&handler)
 {
-    getBuildActionFile(params, &BuildAction::artefacts, std::move(handler));
+    getBuildActionFile(params, &BuildAction::artefacts, std::move(handler), true);
 }
 
 void postBuildAction(const Params &params, ResponseHandler &&handler)
diff --git a/librepomgr/webapi/session.cpp b/librepomgr/webapi/session.cpp
index fba0dac..843a181 100644
--- a/librepomgr/webapi/session.cpp
+++ b/librepomgr/webapi/session.cpp
@@ -102,19 +102,7 @@ void Session::received(boost::system::error_code ec, size_t bytesTransferred)
     // handle requests to static files (intended for development only; use NGINX in production)
     if (!m_setup.webServer.staticFilesPath.empty() && (path.find("../") == string::npos || path.find("..\\") == string::npos)) {
         const auto filePath = argsToString(m_setup.webServer.staticFilesPath, params.target.path);
-        const auto *mimeType = "text/plain";
-        if (endsWith(params.target.path, ".html")) {
-            mimeType = "text/html";
-        } else if (endsWith(params.target.path, ".json")) {
-            mimeType = "application/json";
-        } else if (endsWith(params.target.path, ".js")) {
-            mimeType = "text/javascript";
-        } else if (endsWith(params.target.path, ".css")) {
-            mimeType = "text/css";
-        } else if (endsWith(params.target.path, ".svg")) {
-            mimeType = "image/svg+xml";
-        }
-        respond(filePath.data(), mimeType, params.target.path);
+        respond(filePath.data(), determineMimeType(params.target.path).data(), params.target.path);
         return;
     }
 
@@ -179,6 +167,27 @@ void Session::responded(boost::system::error_code ec, std::size_t bytesTransferr
     receive();
 }
 
+std::string_view Session::determineMimeType(std::string_view path, std::string_view fallback)
+{
+    if (path.ends_with(".html")) {
+        return "text/html";
+    } else if (path.ends_with(".json")) {
+        return "application/json";
+    } else if (path.ends_with(".js")) {
+        return "text/javascript";
+    } else if (path.ends_with(".css")) {
+        return "text/css";
+    } else if (path.ends_with(".svg")) {
+        return "image/svg+xml";
+    } else if (path.ends_with(".txt") || path.ends_with(".log") || path.ends_with("PKGBUILD")) {
+        return "text/plain";
+    } else if (path.ends_with(".md")) {
+        return "text/plain"; // using text/markdown leads to download prompt in Firefox
+    } else {
+        return fallback;
+    }
+}
+
 void Session::close()
 {
     // send a TCP shutdown
diff --git a/librepomgr/webapi/session.h b/librepomgr/webapi/session.h
index 1685653..27dbcdb 100644
--- a/librepomgr/webapi/session.h
+++ b/librepomgr/webapi/session.h
@@ -29,6 +29,7 @@ public:
     boost::asio::ip::tcp::socket &socket();
     void received(boost::system::error_code ec, std::size_t bytesTransferred);
     void responded(boost::system::error_code ec, std::size_t bytesTransferred, bool shouldClose);
+    static std::string_view determineMimeType(std::string_view path, std::string_view fallback = "text/plain");
 
 private:
     boost::asio::ip::tcp::socket m_socket;