[mod] image proxy: /image with the default network (#6816)

- Changes the path of the /image_proxy endpoint to /image. This ensures that if the user copies the image through the browser, it is named image.png rather than image_proxy.png as the latter can be attributed to searxng hence preserving the privacy of the user.
- Removed the dedicated network for the image proxy. Previously this was used to force http/2 off but since moving to curl from httpx this is not as much of a problem. Now instead uses the default network.

Signed-off-by: vojkovic <git@vojk.au>

searx/network/network.py

@@ -409,14 +409,6 @@ def initialize(
         if isinstance(network, str):
             NETWORKS[engine_name] = NETWORKS[network]
 
-    # the /image_proxy endpoint has a dedicated network.
-    # same parameters than the default network, but HTTP/2 is disabled.
-    # It decreases the CPU load average, and the total time is more or less the same
-    if 'image_proxy' not in NETWORKS:
-        image_proxy_params = default_params.copy()
-        image_proxy_params['enable_http2'] = False
-        NETWORKS['image_proxy'] = new_network(image_proxy_params, logger_name='image_proxy')
-
 
 @atexit.register
 def done():

searx/webapp.py

@@ -117,7 +117,7 @@ from searx import favicons
 from searx.valkeydb import initialize as valkey_initialize
 from searx.sxng_locales import sxng_locales
 import searx.search
-from searx.network import stream as http_stream, set_context_network_name
+from searx.network import stream as http_stream
 
 logger = logger.getChild('webapp')
 
@@ -1012,7 +1012,7 @@ def preferences():
 app.add_url_rule('/favicon_proxy', methods=['GET'], endpoint="favicon_proxy", view_func=favicons.favicon_proxy)
 
 
-@app.route('/image_proxy', methods=['GET'])
+@app.route('/image', methods=['GET'])
 def image_proxy():
     # pylint: disable=too-many-return-statements, too-many-branches
 
@@ -1033,7 +1033,6 @@ def image_proxy():
             'Sec-GPC': '1',
             'DNT': '1',
         }
-        set_context_network_name('image_proxy')
         resp, stream = http_stream(method='GET', url=url, headers=request_headers, allow_redirects=True)
         content_length = resp.headers.get('Content-Length')
         if content_length and content_length.isdigit() and int(content_length) > maximum_size:
@@ -1198,7 +1197,7 @@ def robots():
         """User-agent: *
 Allow: /info/en/about
 Disallow: /stats
-Disallow: /image_proxy
+Disallow: /image
 Disallow: /preferences
 Disallow: /*?*q=*
 """,