diff --git a/src/IO/http.cc b/src/IO/http.cc
index f422bf6..92f74e3 100644
--- a/src/IO/http.cc
+++ b/src/IO/http.cc
@@ -356,26 +356,26 @@ static char *Http_get_referer(const DilloUrl *url)
 /**
  * Generate Content-Type header value for a POST query.
  */
-static Dstr *Http_make_content_type(const DilloUrl *url)
+static std::string Http_make_content_type(const DilloUrl *url)
 {
-   Dstr *dstr;
+   std::string dstr;
 
    if (URL_FLAGS(url) & URL_MultipartEnc) {
       _MSG("submitting multipart/form-data!\n");
-      dstr = dStr_new("multipart/form-data; boundary=\"");
+      dstr = "multipart/form-data; boundary=\"";
       if (URL_DATA(url).size() > 2) {
          /* boundary lines have "--" prepended. Skip that. */
          const char *start = URL_DATA(url).c_str() + 2;
          const char *eol = strchr(start, '\r');
          if (eol)
-            dStr_append_l(dstr, start, eol - start);
+            dstr+= std::string_view{ start, eol - start };
       } else {
          /* Zero parts; arbitrary boundary */
-         dStr_append_c(dstr, '0');
+         dstr+= '0';
       }
-      dStr_append_c(dstr,'"');
+      dstr+= '"';
    } else {
-      dstr = dStr_new("application/x-www-form-urlencoded");
+      dstr = "application/x-www-form-urlencoded";
    }
    return dstr;
 }
@@ -420,7 +420,7 @@ static Dstr *Http_make_query_str(DilloWeb *web, bool_t use_proxy, bool_t use_tls
    auth = a_Auth_get_auth_str(url, request_uri->str);
    referer = Http_get_referer(url);
    if (URL_FLAGS(url) & URL_Post) {
-      Dstr *content_type = Http_make_content_type(url);
+      const auto content_type = Http_make_content_type(url);
       dStr_sprintfa(
          query,
          "POST %s HTTP/1.1\r\n"
@@ -440,10 +440,9 @@ static Dstr *Http_make_query_str(DilloWeb *web, bool_t use_proxy, bool_t use_tls
          "\r\n",
          request_uri->str, URL_AUTHORITY(url), prefs.http_user_agent,
          accept_hdr_value, HTTP_Language_hdr, auth ? auth : "",
-         proxy_auth->str, referer, connection_hdr_val, content_type->str,
+         proxy_auth->str, referer, connection_hdr_val, content_type.c_str(),
          (long)URL_DATA(url).size(), cookies);
       dStr_append_l(query, URL_DATA(url).c_str(), URL_DATA(url).size());
-      dStr_free(content_type, TRUE);
    } else {
       dStr_sprintfa(
          query,