diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6b67384
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/__pycache__/
+/.nvimlog
+/header.bin
\ No newline at end of file
diff --git a/tclcheck.py b/tclcheck.py
index 57b8c98..aaf80b8 100644
--- a/tclcheck.py
+++ b/tclcheck.py
@@ -37,4 +37,10 @@ for s in slaves:
     print("http://{}{}".format(s, fileurl))
 
 if fc.mode == fc.MODE_FULL:
-    print(fc.encrypt_header(fileurl, random.choice(encslaves)))
+    header = fc.do_encrypt_header(random.choice(encslaves), fileurl)
+    if len(header) == 4194320:
+        print("Header length check passed. Writing to header.bin.")
+        with open("header.bin", "wb") as f:
+            f.write(header)
+    else:
+        print("Header length invalid ({}).".format(len(header)))
diff --git a/tcllib.py b/tcllib.py
index f0ed78d..fea4243 100644
--- a/tcllib.py
+++ b/tcllib.py
@@ -188,17 +188,14 @@ class FotaCheck:
         encslaves = [s.text for s in enc_list]
         return fileid, fileurl, slaves, encslaves
 
-    def encrypt_header(self, address, encslave):
+    def do_encrypt_header(self, encslave, address):
         params = self.get_creds()
         params[b"address"] = bytes(address, "utf-8")
         url = "https://" + encslave + "/encrypt_header.php"
         req = self.sess.post(url, data=params, verify=False)
         # Expect "HTTP 206 Partial Content" response
-        if req.status_code == 206:  # partial
-            #return req.content
-            contentlength = int(req.headers["Content-Length"])
-            sentinel = "\nHEADER FOUND" if contentlength == 4194320 else "\nNO HEADER FOUND"
-            return sentinel
+        if req.status_code == 206:
+            return req.content
         else:
             print("ENCRYPT: " + repr(req))
             print(repr(req.headers))