[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/oscar/results.html b/searx/templates/oscar/results.html
index f712e5779..ce557daf9 100644
--- a/searx/templates/oscar/results.html
+++ b/searx/templates/oscar/results.html
@@ -5,6 +5,7 @@
     <input type="hidden" name="pageno" value="{{ pageno }}" />

     <input type="hidden" name="time_range" value="{{ time_range }}" />

     <input type="hidden" name="language" value="{{ current_language }}" />

+    <input type="hidden" name="timeout_limit" value="{{ timeout_limit }}" />

 {%- endmacro %}

 {%- macro search_url() %}{{ base_url }}?q={{ q|urlencode }}{% if selected_categories %}&amp;categories={{ selected_categories|join(",") | replace(' ','+') }}{% endif %}{% if pageno > 1 %}&amp;pageno={{ pageno }}{% endif %}{% if time_range %}&amp;time_range={{ time_range }}{% endif %}{% if current_language != 'all' %}&amp;language={{ current_language }}{% endif %}{% endmacro -%}