From 97d0856a04ee285eaf2412afeb98e724e3360652 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Richard=20K=C3=B6rber?= <github@shredzone.org>
Date: Fri, 18 Dec 2015 00:29:33 +0100
Subject: [PATCH] Log HTTP headers in debug mode

---
 .../acme4j/impl/DefaultConnection.java         | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/impl/DefaultConnection.java b/acme4j-client/src/main/java/org/shredzone/acme4j/impl/DefaultConnection.java
index 1297178c..ca1e0333 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/impl/DefaultConnection.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/impl/DefaultConnection.java
@@ -91,6 +91,8 @@ public class DefaultConnection implements Connection {
 
             conn.connect();
 
+            logHeaders();
+
             return conn.getResponseCode();
         } catch (IOException ex) {
             throw new AcmeException("API access failed", ex);
@@ -131,6 +133,8 @@ public class DefaultConnection implements Connection {
             conn.setFixedLengthStreamingMode(outputData.length);
             conn.connect();
 
+            logHeaders();
+
             try (OutputStream out = conn.getOutputStream()) {
                 out.write(outputData);
             }
@@ -313,4 +317,18 @@ public class DefaultConnection implements Connection {
         return Base64Url.decode(nonceHeader);
     }
 
+    /**
+     * Log all HTTP headers in debug mode.
+     */
+    private void logHeaders() {
+        if (LOG.isDebugEnabled()) {
+            Map<String, List<String>> headers = conn.getHeaderFields();
+            for (String key : headers.keySet()) {
+                for (String value : headers.get(key)) {
+                    LOG.debug("HEADER {}: {}", key, value);
+                }
+            }
+        }
+    }
+
 }