fts-solr: Explicitly ask for XML responses

With recent solr versions (7.0+) the default response
writer changed from XML to JSON. This commit sets the
"wt" query parameter for all requests, so that the right
response type is written.

diff --git a/src/plugins/fts-solr/fts-backend-solr.c b/src/plugins/fts-solr/fts-backend-solr.c
index 46d1974dd08f921c939aad5c9820b156c35ff8d3..372ae6dfd199d51abe9ed39fe87f2e4d621bdcc0 100644 (file)
--- a/src/plugins/fts-solr/fts-backend-solr.c
+++ b/src/plugins/fts-solr/fts-backend-solr.c
@@ -224,7 +224,7 @@ get_last_uid_fallback(struct fts_backend *_backend, struct mailbox *box,
        int ret = 0;
 
        str = t_str_new(256);
-       str_append(str, "fl=uid&rows=1&sort=uid+desc&q=");
+       str_append(str, "wt=xml&fl=uid&rows=1&sort=uid+desc&q=");
 
        if (fts_mailbox_get_guid(box, &box_guid) < 0)
                return -1;
@@ -836,7 +836,7 @@ fts_backend_solr_lookup(struct fts_backend *_backend, struct mailbox *box,
        mailbox_get_open_status(box, STATUS_UIDNEXT, &status);
 
        str = t_str_new(256);
-       str_printfa(str, "fl=uid,score&rows=%u&sort=uid+asc&q=%%7b!lucene+q.op%%3dAND%%7d",
+       str_printfa(str, "wt=xml&fl=uid,score&rows=%u&sort=uid+asc&q=%%7b!lucene+q.op%%3dAND%%7d",
                    status.uidnext);
        prefix_len = str_len(str);
 
@@ -946,7 +946,7 @@ fts_backend_solr_lookup_multi(struct fts_backend *backend,
        string_t *str;
 
        str = t_str_new(256);
-       str_printfa(str, "fl=box,uid,score&rows=%u&sort=box+asc,uid+asc&q=%%7b!lucene+q.op%%3dAND%%7d",
+       str_printfa(str, "wt=xml&fl=box,uid,score&rows=%u&sort=box+asc,uid+asc&q=%%7b!lucene+q.op%%3dAND%%7d",
                    SOLR_MAX_MULTI_ROWS);
 
        if (solr_add_definite_query_args(str, args, and_args)) {