diff --git a/angie/autoconf.dist/core-worker-env.conf.j2 b/angie/autoconf.dist/core-worker-env.conf.j2
index 61a6ce1..3367dab 100644
--- a/angie/autoconf.dist/core-worker-env.conf.j2
+++ b/angie/autoconf.dist/core-worker-env.conf.j2
@@ -26,6 +26,6 @@ env {{ k }};
 ##
   {%- for k in c_vars_override %}
     {#- {%- set v = c_env[k] %} #}
-## env {{ k }}={{ c_env[k].__repr__() }};
+## env {{ k }}={{ c_env[k] | ngx_esc }};
   {%- endfor %}
 {%- endif %}
\ No newline at end of file
diff --git a/angie/autoconf.dist/http-alt-svc.conf.j2 b/angie/autoconf.dist/http-alt-svc.conf.j2
index f764b23..42fb313 100644
--- a/angie/autoconf.dist/http-alt-svc.conf.j2
+++ b/angie/autoconf.dist/http-alt-svc.conf.j2
@@ -7,6 +7,5 @@
 {%- set proto = proto | re_sub('^v3$', 'h3=":443"; ma=3600') -%}
 {#- main part -#}
 {%- if proto %}
-{#- TODO: precise quotation #}
-add_header  Alt-Svc  {{ (proto | join(', ')).__repr__() }};
+add_header  Alt-Svc  {{ (proto | join(', ')) | ngx_esc }};
 {%- endif %}
\ No newline at end of file
diff --git a/angie/autoconf.dist/http-request-headers-basic.conf.j2 b/angie/autoconf.dist/http-request-headers-basic.conf.j2
index 65a5166..2c20f8d 100644
--- a/angie/autoconf.dist/http-request-headers-basic.conf.j2
+++ b/angie/autoconf.dist/http-request-headers-basic.conf.j2
@@ -11,7 +11,7 @@ map $http_user_agent
     default  $http_user_agent;
 {%- if env.NGX_HTTP_FAKE_UA %}
     ## merely fake
-    ""  {{ env.NGX_HTTP_FAKE_UA.__repr__() }};
+    ""  {{ env.NGX_HTTP_FAKE_UA | ngx_esc }};
 {%- else %}
     ""  "Angie/$angie_version";
 {%- endif %}
diff --git a/angie/conf.dist/fastcgi/cache-bypass.conf.j2 b/angie/conf.dist/fastcgi/cache-bypass.conf.j2
index cb5095c..dbf6b85 100644
--- a/angie/conf.dist/fastcgi/cache-bypass.conf.j2
+++ b/angie/conf.dist/fastcgi/cache-bypass.conf.j2
@@ -1,15 +1,14 @@
-{#- TODO: precise quotation -#}
 {%- set cache_bypass = j2cfg.cache_bypass or [] -%}
 {%- if cache_bypass -%}
 ## disable (response) cache under following conditions
 fastcgi_cache_bypass
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 fastcgi_no_cache
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 {%- endif -%}
\ No newline at end of file
diff --git a/angie/conf.dist/grpc/ssl.conf.j2 b/angie/conf.dist/grpc/ssl.conf.j2
index b7ee94c..cc0a9aa 100644
--- a/angie/conf.dist/grpc/ssl.conf.j2
+++ b/angie/conf.dist/grpc/ssl.conf.j2
@@ -1,6 +1,5 @@
 {%- for k, v in j2cfg.tls.conf_cmd.items() %}
-{#- TODO: precise quotation #}
-grpc_ssl_conf_command  {{ k }}  {{ v.__repr__() }};
+grpc_ssl_conf_command  {{ k }}  {{ v | ngx_esc }};
 {%- endfor %}
 
 grpc_ssl_trusted_certificate {{ env.NGX_SSL_CERT_FILE }};
diff --git a/angie/conf.dist/http-ssl.conf.j2 b/angie/conf.dist/http-ssl.conf.j2
index 6157286..d86cfde 100644
--- a/angie/conf.dist/http-ssl.conf.j2
+++ b/angie/conf.dist/http-ssl.conf.j2
@@ -15,12 +15,10 @@ ssl_stapling_verify on;
 ssl_stapling_verify off;
   {%- endif %}
   {%- if j2cfg.tls.stapling.file %}
-{#- TODO: precise quotation #}
-ssl_stapling_file {{ j2cfg.tls.stapling.file.__repr__() }};
+ssl_stapling_file {{ j2cfg.tls.stapling.file | ngx_esc }};
   {%- endif %}
   {%- if j2cfg.tls.stapling.responder %}
-{#- TODO: precise quotation #}
-ssl_stapling_responder {{ j2cfg.tls.stapling.responder.__repr__() }};
+ssl_stapling_responder {{ j2cfg.tls.stapling.responder | ngx_esc }};
   {%- endif %}
 {%- else %}
 ssl_stapling off;
diff --git a/angie/conf.dist/proxy-http/cache-bypass.conf.j2 b/angie/conf.dist/proxy-http/cache-bypass.conf.j2
index fb6357c..69d1110 100644
--- a/angie/conf.dist/proxy-http/cache-bypass.conf.j2
+++ b/angie/conf.dist/proxy-http/cache-bypass.conf.j2
@@ -1,15 +1,14 @@
-{#- TODO: precise quotation -#}
 {%- set cache_bypass = j2cfg.cache_bypass or [] -%}
 {%- if cache_bypass -%}
 ## disable (response) cache under following conditions
 proxy_cache_bypass
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 proxy_no_cache
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 {%- endif -%}
\ No newline at end of file
diff --git a/angie/conf.dist/proxy/ssl.conf.j2 b/angie/conf.dist/proxy/ssl.conf.j2
index 0deaaef..3d583b3 100644
--- a/angie/conf.dist/proxy/ssl.conf.j2
+++ b/angie/conf.dist/proxy/ssl.conf.j2
@@ -1,6 +1,5 @@
 {%- for k, v in j2cfg.tls.conf_cmd.items() %}
-{#- TODO: precise quotation #}
-proxy_ssl_conf_command  {{ k }}  {{ v.__repr__() }};
+proxy_ssl_conf_command  {{ k }}  {{ v | ngx_esc }};
 {%- endfor %}
 
 proxy_ssl_trusted_certificate {{ env.NGX_SSL_CERT_FILE }};
diff --git a/angie/conf.dist/scgi/cache-bypass.conf.j2 b/angie/conf.dist/scgi/cache-bypass.conf.j2
index b08bae2..8d7d52b 100644
--- a/angie/conf.dist/scgi/cache-bypass.conf.j2
+++ b/angie/conf.dist/scgi/cache-bypass.conf.j2
@@ -1,15 +1,14 @@
-{#- TODO: precise quotation -#}
 {%- set cache_bypass = j2cfg.cache_bypass or [] -%}
 {%- if cache_bypass -%}
 ## disable (response) cache under following conditions
 scgi_cache_bypass
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 scgi_no_cache
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 {%- endif -%}
\ No newline at end of file
diff --git a/angie/conf.dist/ssl/cmd.conf.j2 b/angie/conf.dist/ssl/cmd.conf.j2
index 2b17c6e..f484e2a 100644
--- a/angie/conf.dist/ssl/cmd.conf.j2
+++ b/angie/conf.dist/ssl/cmd.conf.j2
@@ -1,4 +1,3 @@
 {%- for k, v in j2cfg.tls.conf_cmd.items() %}
-{#- TODO: precise quotation #}
-ssl_conf_command  {{ k }}  {{ v.__repr__() }};
+ssl_conf_command  {{ k }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/conf.dist/uwsgi/cache-bypass.conf.j2 b/angie/conf.dist/uwsgi/cache-bypass.conf.j2
index 4571bb0..09a35f7 100644
--- a/angie/conf.dist/uwsgi/cache-bypass.conf.j2
+++ b/angie/conf.dist/uwsgi/cache-bypass.conf.j2
@@ -1,15 +1,14 @@
-{#- TODO: precise quotation -#}
 {%- set cache_bypass = j2cfg.cache_bypass or [] -%}
 {%- if cache_bypass -%}
 ## disable (response) cache under following conditions
 uwsgi_cache_bypass
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 uwsgi_no_cache
 {%- for v in cache_bypass %}
-    {{ v.__repr__() }}
+    {{ v | ngx_esc }}
 {%- endfor %}
 ;
 {%- endif -%}
\ No newline at end of file
diff --git a/angie/conf.dist/uwsgi/ssl.conf.j2 b/angie/conf.dist/uwsgi/ssl.conf.j2
index 5aa4cc7..58be3c4 100644
--- a/angie/conf.dist/uwsgi/ssl.conf.j2
+++ b/angie/conf.dist/uwsgi/ssl.conf.j2
@@ -1,6 +1,5 @@
 {%- for k, v in j2cfg.tls.conf_cmd.items() %}
-{#- TODO: precise quotation #}
-uwsgi_ssl_conf_command  {{ k }}  {{ v.__repr__() }};
+uwsgi_ssl_conf_command  {{ k }}  {{ v | ngx_esc }};
 {%- endfor %}
 
 uwsgi_ssl_trusted_certificate {{ env.NGX_SSL_CERT_FILE }};
diff --git a/angie/snip.dist/fastcgi-request-headers.j2 b/angie/snip.dist/fastcgi-request-headers.j2
index 594e11d..73b81f9 100644
--- a/angie/snip.dist/fastcgi-request-headers.j2
+++ b/angie/snip.dist/fastcgi-request-headers.j2
@@ -1,7 +1,6 @@
 ## sourced by conf.d/fastcgi/headers.conf
-## hide/remove request headers
+## set/remove request headers
 {%- set req_hdr_dict = j2cfg.request_headers or {} -%}
 {%- for h, v in req_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-fastcgi_param  {{ h | as_cgi_header }}  {{ v.__repr__() }};
+fastcgi_param  {{ h | as_cgi_header }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/snip.dist/grpc-request-headers.j2 b/angie/snip.dist/grpc-request-headers.j2
index 4be0b17..5161818 100644
--- a/angie/snip.dist/grpc-request-headers.j2
+++ b/angie/snip.dist/grpc-request-headers.j2
@@ -1,7 +1,6 @@
 ## sourced by conf.d/grpc/headers.conf
-## hide/remove request headers
+## set/remove request headers
 {%- set req_hdr_dict = j2cfg.request_headers or {} -%}
 {%- for h, v in req_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-grpc_set_header  {{ h }}  {{ v.__repr__() }};
+grpc_set_header  {{ h }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/snip.dist/http-response-headers.j2 b/angie/snip.dist/http-response-headers.j2
index 9b578a8..32662a0 100644
--- a/angie/snip.dist/http-response-headers.j2
+++ b/angie/snip.dist/http-response-headers.j2
@@ -2,6 +2,5 @@
 ## add response headers
 {%- set resp_hdr_dict = j2cfg.response_headers or {} -%}
 {%- for h, v in resp_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-add_header  {{ h }}  {{ v.__repr__() }};
+add_header  {{ h }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/snip.dist/proxy-request-headers.j2 b/angie/snip.dist/proxy-request-headers.j2
index b86adc3..28080bf 100644
--- a/angie/snip.dist/proxy-request-headers.j2
+++ b/angie/snip.dist/proxy-request-headers.j2
@@ -1,7 +1,6 @@
 ## sourced by conf.d/proxy-http/headers.conf
-## hide/remove request headers
+## set/remove request headers
 {%- set req_hdr_dict = j2cfg.request_headers or {} -%}
 {%- for h, v in req_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-proxy_set_header  {{ h }}  {{ v.__repr__() }};
+proxy_set_header  {{ h }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/snip.dist/scgi-request-headers.j2 b/angie/snip.dist/scgi-request-headers.j2
index f6bebbd..1ea6704 100644
--- a/angie/snip.dist/scgi-request-headers.j2
+++ b/angie/snip.dist/scgi-request-headers.j2
@@ -1,7 +1,6 @@
 ## sourced by conf.d/scgi/headers.conf
-## hide/remove request headers
+## set/remove request headers
 {%- set req_hdr_dict = j2cfg.request_headers or {} -%}
 {%- for h, v in req_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-scgi_param  {{ h | as_cgi_header }}  {{ v.__repr__() }};
+scgi_param  {{ h | as_cgi_header }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/angie/snip.dist/uwsgi-request-headers.j2 b/angie/snip.dist/uwsgi-request-headers.j2
index b045da3..7e45c1b 100644
--- a/angie/snip.dist/uwsgi-request-headers.j2
+++ b/angie/snip.dist/uwsgi-request-headers.j2
@@ -1,7 +1,6 @@
 ## sourced by conf.d/uwsgi/headers.conf
-## hide/remove request headers
+## set/remove request headers
 {%- set req_hdr_dict = j2cfg.request_headers or {} -%}
 {%- for h, v in req_hdr_dict.items() %}
-{#- TODO: precise quotation #}
-uwsgi_param  {{ h | as_cgi_header }}  {{ v.__repr__() }};
+uwsgi_param  {{ h | as_cgi_header }}  {{ v | ngx_esc }};
 {%- endfor %}
\ No newline at end of file
diff --git a/j2cfg/j2cfg/functions.py b/j2cfg/j2cfg/functions.py
index 7645c74..480d791 100644
--- a/j2cfg/j2cfg/functions.py
+++ b/j2cfg/j2cfg/functions.py
@@ -240,6 +240,27 @@ def sh_like_file_to_list(j2env, file_in: str) -> list:
     ))
 
 
+def ngx_esc(x):
+    if isinstance(x, str):
+        if x == "":
+            return "''"
+        if re.search(r'(?:\s|[;{}()\[\]\\\'"])', x):
+            return repr(x)
+        return x
+    if is_sequence(x):
+        return uniq([
+            ngx_esc(v)
+            for v in x
+        ])
+    if is_mapping(x):
+        return dict_remap_keys(
+            x, ngx_esc
+        )
+    if x is None:
+        return None
+    return ngx_esc(str(x))
+
+
 def merge_dict_recurse(d1, d2: dict) -> dict:
     x = {} | d1
 
@@ -290,6 +311,7 @@ J2CFG_FILTERS = [
     is_sequence,
     list_diff,
     list_intersect,
+    ngx_esc,
     re_fullmatch,
     re_fullmatch_negate,
     re_match,