[enh] Add timeout limit per request (#1640)

The new url parameter "timeout_limit" set timeout limit defined in second.
Example "timeout_limit=1.5" means the timeout limit is 1.5 seconds.

In addition, the query can start with <[number] to set the timeout limit.

For number between 0 and 99, the unit is the second :
Example: "<30 searx" means the timeout limit is 3 seconds

For number above 100, the unit is the millisecond:
Example: "<850 searx" means the timeout is 850 milliseconds.

In addition, there is a new optional setting: outgoing.max_request_timeout.
If not set, the user timeout can't go above searx configuration (as before: the max timeout of selected engine for a query).

If the value is set, the user can set a timeout between 0 and max_request_timeout using
<[number] or timeout_limit query parameter.

Related to #1077
Updated version of PR #1413 from @isj-privacore

1 files changed, 1 insertions, 0 deletions

diff --git a/searx/templates/simple/search.html b/searx/templates/simple/search.html
index 9c4a99b68..e9023b420 100644
--- a/searx/templates/simple/search.html
+++ b/searx/templates/simple/search.html
@@ -14,4 +14,5 @@
   {% include 'simple/categories.html' %}
   <input type="hidden" name="safesearch" value="{{ safesearch }}" >
   <input type="hidden" name="theme" value="{{ theme }}" >
+  {% if timeout_limit %}<input type="hidden" name="timeout_limit" value="{{ timeout_limit|e }}" >{% endif %}
 </form>