diff -r 08adb4f87160 -r cf054cded046 libidav/utils.c
--- a/libidav/utils.c	Thu Oct 15 15:01:50 2015 +0200
+++ b/libidav/utils.c	Thu Oct 15 15:36:26 2015 +0200
@@ -283,6 +283,81 @@
     return ret;
 }
 
+static size_t util_header_callback(char *buffer, size_t size,
+        size_t nitems, void *data) {
+    
+    char *duped; // local variable for string duplicates
+    
+    UcxMap *map = (UcxMap*) data;
+    
+    // if we get a status line, clear the map and exit
+    if(size*nitems >= 5 && !strncmp("HTTP/", buffer, 5)) {
+        ucx_map_free_content(map, free);
+        ucx_map_clear(map);
+        return size*nitems;
+    }
+    
+    // if we get the terminating CRLF, just exit
+    if (size*nitems == 2 && !strncmp("\r\n", buffer, 2)) {
+        return 2;
+    }
+    
+    
+    // get header key
+    size_t s = 0;
+    do {
+        s++;
+    } while(buffer[s] != ':');
+    char *value = buffer+s+1;
+    
+    // remove trailing spaces
+    while(isspace(buffer[s-1])) {
+        s--;
+    }
+    
+    // save key as all lower case
+    duped = malloc(s);
+    for(size_t i = 0;i<s;i++) {
+        duped[i] = tolower(buffer[i]);
+    }
+    UcxKey key = ucx_key(duped, s);
+    
+    // get trimmed header value
+    while(isspace(*value)) {
+        value++;
+    }
+    s = size*nitems - (value - buffer);
+    while(isspace(value[s-1])) {
+        s--;
+    }
+    
+    // copy header value and append NULL byte (curl does not provide one)
+    duped = malloc(s+1);
+    memcpy(duped, value, s+1);
+    duped[s] = '\0';
+    
+    char *oldval = ucx_map_get(map, key);
+    if(oldval) {
+        free(oldval);
+    }
+    
+    ucx_map_put(map, key, duped);
+    free(key.data); // ucx_map_put made a copy, so we free this memory
+    
+    return nitems * size;    
+}
+
+void util_capture_header(CURL *handle, UcxMap* map) {
+    if(!map) {
+        // deactivate capturing
+        curl_easy_setopt(handle, CURLOPT_HEADERFUNCTION, NULL);
+        return;
+    }
+    
+    curl_easy_setopt(handle, CURLOPT_HEADERFUNCTION, util_header_callback);
+    curl_easy_setopt(handle, CURLOPT_HEADERDATA, map);
+}
+
 char* util_resource_name(char *url) {
     int si = 0;
     int osi = 0;