add optional request with GET method for search and results pages

searx/templates/preferences.html

         </p>
     </fieldset>
     <fieldset>
+        <legend>{{ _('Method') }}</legend>
+        <p>
+        <select name='method'>
+            <option value="POST" {% if method == 'POST' %}selected="selected"{% endif %}>POST</option>
+            <option value="GET" {% if method == 'GET' %}selected="selected"{% endif %}>GET</option>
+        </select>
+        </p>
+    </fieldset>
+    <fieldset>
     <legend>{{ _('Currently used search engines') }}</legend>
 
     <table>

searx/templates/results.html

         {% if suggestions %}
         <div id="suggestions"><span>{{ _('Suggestions') }}</span>
             {% for suggestion in suggestions %}
-            <form method="post" action="{{ url_for('index') }}">
+            <form method="{{ method or 'POST' }}" action="{{ url_for('index') }}">
                 <input type="hidden" name="q" value="{{ suggestion }}">
                 <input type="submit" value="{{ suggestion }}" />
             </form>
         <div id="apis">
         {{ _('Download results') }}
         {% for output_type in ('csv', 'json', 'rss') %}
-        <form method="post" action="{{ url_for('index') }}">
+        <form method="{{ method or 'POST' }}" action="{{ url_for('index') }}">
             <div class="left">
             <input type="hidden" name="q" value="{{ q }}" />
             <input type="hidden" name="format" value="{{ output_type }}" />
     {% if paging %}
     <div id="pagination">
         {% if pageno > 1 %}
-            <form method="post" action="{{ url_for('index') }}">
+            <form method="{{ method or 'POST' }}" action="{{ url_for('index') }}">
                 <div class="left">
                 <input type="hidden" name="q" value="{{ q }}" />
                 {% for category in selected_categories %}
                 </div>
             </form>
         {% endif %}
-        <form method="post" action="{{ url_for('index') }}">
+        <form method="{{ method or 'POST' }}" action="{{ url_for('index') }}">
             <div class="left">
             {% for category in selected_categories %}
             <input type="hidden" name="category_{{ category }}" value="1"/>

searx/templates/search.html

-<form method="post" action="{{ url_for('index') }}" id="search_form">
+<form method="{{ method or 'POST' }}" action="{{ url_for('index') }}" id="search_form">
   <div id="search_wrapper">
     <input type="text" placeholder="{{ _('Search for...') }}" id="q" class="q" name="q" tabindex="1" autocomplete="off" {% if q %}value="{{ q }}"{% endif %}/>
     <input type="submit" value="search" id="search_submit" />

searx/webapp.py

     if not 'autocomplete' in kwargs:
         kwargs['autocomplete'] = autocomplete
 
+    kwargs['method'] = request.cookies.get('method', 'POST')
+
     return render_template(template_name, **kwargs)
 
 
         selected_categories = []
         locale = None
         autocomplete = ''
+        method = 'POST'
         for pd_name, pd in request.form.items():
             if pd_name.startswith('category_'):
                 category = pd_name[9:]
                                             pd in (x[0] for
                                                    x in language_codes)):
                 lang = pd
+            elif pd_name == 'method':
+                method = pd
             elif pd_name.startswith('engine_'):
                 engine_name = pd_name.replace('engine_', '', 1)
                 if engine_name in engines:
                 max_age=cookie_max_age
             )
 
+        resp.set_cookie('method', method, max_age=cookie_max_age)
+
         return resp
     return render('preferences.html',
                   locales=settings['locales'],