Fix compression.

The "Content-Encoding: deflate" header is now added from
within the compression routine itself, and _not_ from the
"exchange handle".

This fixed the bank-lib functions as those do not use any
exchange handle, and therefore were wrongly sending compressed
bodies without adding the mentioned HTTP header.

src/bank-lib/bank_api_admin.c

@@ -189,7 +189,6 @@ TALER_BANK_admin_add_incoming (struct GNUNET_CURL_Context *ctx,
   struct TALER_BANK_AdminAddIncomingHandle *aai;
   json_t *admin_obj;
   CURL *eh;
-  struct curl_slist *headers = NULL;
 
   if (NULL == exchange_base_url)
   {
@@ -213,11 +212,13 @@ TALER_BANK_admin_add_incoming (struct GNUNET_CURL_Context *ctx,
   aai->cb_cls = res_cb_cls;
   aai->request_url = TALER_BANK_path_to_url_ (bank_base_url,
                                               "/admin/add/incoming");
-  headers = TALER_BANK_make_auth_header_ (auth);
+  aai->post_ctx.headers = TALER_BANK_make_auth_header_ (auth);
+
+  GNUNET_assert
+    (NULL != (aai->post_ctx.headers = curl_slist_append
+      (aai->post_ctx.headers,
+       "Content-Type: application/json")));
 
-  GNUNET_assert (NULL !=
-                 (headers = curl_slist_append (headers,
-                                               "Content-Type: application/json")));
   eh = curl_easy_init ();
 
   GNUNET_assert (GNUNET_OK ==
@@ -232,7 +233,7 @@ TALER_BANK_admin_add_incoming (struct GNUNET_CURL_Context *ctx,
 
   aai->job = GNUNET_CURL_job_add2 (ctx,
                                    eh,
-                                   headers,
+                                   aai->post_ctx.headers,
                                    &handle_admin_add_incoming_finished,
                                    aai);
   return aai;

src/lib/exchange_api_handle.c

@@ -1784,12 +1784,6 @@ TALER_EXCHANGE_connect
   GNUNET_break (GNUNET_OK ==
 		GNUNET_CURL_append_header (ctx,
 					   "Expect:"));
-#if COMPRESS_BODIES
-  /* Tell exchange we compress bodies */
-  GNUNET_break (GNUNET_OK ==
-		GNUNET_CURL_append_header (ctx,
-                                   "Content-Encoding: deflate"));
-#endif
   exchange = GNUNET_new (struct TALER_EXCHANGE_Handle);
   exchange->ctx = ctx;
   exchange->url = GNUNET_strdup (url);

src/lib/teah_common.c

@@ -78,6 +78,10 @@ TEAH_curl_easy_post (struct TEAH_PostContext *ctx,
     slen = (size_t) cbuf_size;
     ctx->json_enc = (char *) cbuf;
   }
+  GNUNET_assert
+  (NULL != (ctx->headers = curl_slist_append
+    (ctx->headers,
+     "Content-Encoding: deflate")));
 #else
   ctx->json_enc = str;
 #endif

src/lib/teah_common.h

@@ -30,7 +30,7 @@
 /**
  * Should we compress PUT/POST bodies with 'deflate' encoding?
  */
-#define COMPRESS_BODIES 0
+#define COMPRESS_BODIES 1
 
 /**
  * State used for #TEAL_curl_easy_post() and
@@ -43,6 +43,10 @@ struct TEAH_PostContext
    */
   char *json_enc;
 
+  /**
+   * Custom headers.
+   */
+  struct curl_slist *headers;
 };