golang-snippets

jolav · Oct 7, 2024 · 09d1fca · 09d1fca
1 parent 5ce0b71
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Showing 24 changed files with 215 additions and 40 deletions.
diff --git a/docs/golang-snippets.md b/docs/golang-snippets.md
@@ -289,6 +289,14 @@ func IsJSON(str string) bool {
 }
 ```
 
+### IsPointer
+
+```go
+func IsPointer(d interface{}) bool {
+	return reflect.TypeOf(d).Kind() == reflect.Ptr
+}
+```
+
 ---
 
 ## FILES
@@ -840,6 +848,23 @@ func GetIP(r *http.Request) string {
 }
 ```
 
+### GetRequestOrigin  
+
+```go
+func GetRequestOrigin(r *http.Request) string {
+	switch {
+	case r.Header.Get("Host") != "":
+		return r.Header.Get("Host")
+	case r.Header.Get("Origin") != "":
+		return r.Header.Get("Origin")
+	case r.Header.Get("Referer") != "":
+		return r.Header.Get("Referer")
+	default:
+		return "?????"
+	}
+}
+```
+
 ### IsValidURL  
 
 ```go
@@ -925,6 +950,54 @@ func RemoveProtocolAndWWWL(url string) string {
 }
 ```
 
+### Nginx return 444
+
+```go
+func close(w http.ResponseWriter, r *http.Request) {
+	hijacker, ok := w.(http.Hijacker)
+	if !ok {
+		http.Error(w, "Server does not support hijacking", http.StatusInternalServerError)
+		return
+	}
+	conn, _, err := hijacker.Hijack()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	conn.Close()
+	return
+}
+```
+
+### Slow Response  
+
+```go
+func slowSend(w http.ResponseWriter, r *http.Request) {
+	flusher, ok := w.(http.Flusher)
+	if !ok {
+		err := "Server does not support flusher"
+		http.Error(w, err, http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "text/plain")
+	fmt.Fprintln(w, "Initiating slow response...")
+
+	for i := 0; i < 100; i++ {
+		fmt.Fprintf(w, "Fragmento %d\n", i+1)
+		flusher.Flush()
+		time.Sleep(1 * time.Second)
+	}
+
+	fmt.Fprintln(w, "Task accomplished")
+}
+
+func holdConn(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(w, "Begin.............")
+	time.Sleep(60 * time.Second)
+	fmt.Fprintf(w, "Thats all")
+}
+```
 ---
 
 ## NUMBERS

diff --git a/www/404.html b/www/404.html
@@ -384,7 +384,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.134713+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.313159+00:00
   -->
 </body>
 

diff --git a/www/css/index.html b/www/css/index.html
@@ -1504,7 +1504,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.176982+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.335780+00:00
   -->
 </body>
 

diff --git a/www/debian/index.html b/www/debian/index.html
@@ -2488,7 +2488,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.195883+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.343454+00:00
   -->
 </body>
 

diff --git a/www/expressjs/index.html b/www/expressjs/index.html
@@ -1489,7 +1489,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.219100+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.353656+00:00
   -->
 </body>
 

diff --git a/www/frontend/index.html b/www/frontend/index.html
@@ -537,7 +537,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.230371+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.361212+00:00
   -->
 </body>
 

diff --git a/www/golang-bases-de-datos/index.html b/www/golang-bases-de-datos/index.html
@@ -764,7 +764,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.236388+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.363150+00:00
   -->
 </body>
 

diff --git a/www/golang-para-web/index.html b/www/golang-para-web/index.html
@@ -1556,7 +1556,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.240116+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.364793+00:00
   -->
 </body>
 

diff --git a/www/golang-snippets/index.html b/www/golang-snippets/index.html
@@ -310,6 +310,11 @@ <h3 id="isjson">IsJSON</h3>
     return json.Unmarshal([]byte(str), &amp;js) == nil
 }
 </code></pre>
+<h3 id="ispointer">IsPointer</h3>
+<pre><code class="language-go">func IsPointer(d interface{}) bool {
+    return reflect.TypeOf(d).Kind() == reflect.Ptr
+}
+</code></pre>
 <hr />
 <h2 id="files">FILES</h2>
 <h3 id="readfile">ReadFile</h3>
@@ -806,6 +811,20 @@ <h3 id="getip">GetIP</h3>
     return strings.TrimSpace(ip)
 }
 </code></pre>
+<h3 id="getrequestorigin">GetRequestOrigin</h3>
+<pre><code class="language-go">func GetRequestOrigin(r *http.Request) string {
+    switch {
+    case r.Header.Get(&quot;Host&quot;) != &quot;&quot;:
+        return r.Header.Get(&quot;Host&quot;)
+    case r.Header.Get(&quot;Origin&quot;) != &quot;&quot;:
+        return r.Header.Get(&quot;Origin&quot;)
+    case r.Header.Get(&quot;Referer&quot;) != &quot;&quot;:
+        return r.Header.Get(&quot;Referer&quot;)
+    default:
+        return &quot;?????&quot;
+    }
+}
+</code></pre>
 <h3 id="isvalidurl">IsValidURL</h3>
 <pre><code class="language-go">// IsValidURL ...
 func IsValidURL(rawurl string) bool {
@@ -876,6 +895,49 @@ <h3 id="removeprotocolandwwwfromurl">RemoveProtocolAndWWWFromURL</h3>
     return url
 }
 </code></pre>
+<h3 id="nginx-return-444">Nginx return 444</h3>
+<pre><code class="language-go">func close(w http.ResponseWriter, r *http.Request) {
+    hijacker, ok := w.(http.Hijacker)
+    if !ok {
+        http.Error(w, &quot;Server does not support hijacking&quot;, http.StatusInternalServerError)
+        return
+    }
+    conn, _, err := hijacker.Hijack()
+    if err != nil {
+        http.Error(w, err.Error(), http.StatusInternalServerError)
+        return
+    }
+    conn.Close()
+    return
+}
+</code></pre>
+<h3 id="slow-response">Slow Response</h3>
+<pre><code class="language-go">func slowSend(w http.ResponseWriter, r *http.Request) {
+    flusher, ok := w.(http.Flusher)
+    if !ok {
+        err := &quot;Server does not support flusher&quot;
+        http.Error(w, err, http.StatusInternalServerError)
+        return
+    }
+
+    w.Header().Set(&quot;Content-Type&quot;, &quot;text/plain&quot;)
+    fmt.Fprintln(w, &quot;Initiating slow response...&quot;)
+
+    for i := 0; i &lt; 100; i++ {
+        fmt.Fprintf(w, &quot;Fragmento %d\n&quot;, i+1)
+        flusher.Flush()
+        time.Sleep(1 * time.Second)
+    }
+
+    fmt.Fprintln(w, &quot;Task accomplished&quot;)
+}
+
+func holdConn(w http.ResponseWriter, r *http.Request) {
+    fmt.Fprintf(w, &quot;Begin.............&quot;)
+    time.Sleep(60 * time.Second)
+    fmt.Fprintf(w, &quot;Thats all&quot;)
+}
+</code></pre>
 <hr />
 <h2 id="numbers">NUMBERS</h2>
 <h3 id="getrandomint">GetRandomInt</h3>
@@ -1663,6 +1725,11 @@ <h3>Contenidos</h3>
   <li><a href="#isjson">IsJSON</a></li>
   <ul>
   
+</ul>
+  
+  <li><a href="#ispointer">IsPointer</a></li>
+  <ul>
+  
 </ul>
   
 </ul>
@@ -1738,6 +1805,11 @@ <h3>Contenidos</h3>
   <li><a href="#getip">GetIP</a></li>
   <ul>
   
+</ul>
+  
+  <li><a href="#getrequestorigin">GetRequestOrigin</a></li>
+  <ul>
+  
 </ul>
   
   <li><a href="#isvalidurl">IsValidURL</a></li>
@@ -1763,6 +1835,16 @@ <h3>Contenidos</h3>
   <li><a href="#removeprotocolandwwwfromurl">RemoveProtocolAndWWWFromURL</a></li>
   <ul>
   
+</ul>
+  
+  <li><a href="#nginx-return-444">Nginx return 444</a></li>
+  <ul>
+  
+</ul>
+  
+  <li><a href="#slow-response">Slow Response</a></li>
+  <ul>
+  
 </ul>
   
 </ul>
@@ -2106,6 +2188,11 @@ <h3>Contenidos</h3>
   <li><a href="#isjson">IsJSON</a></li>
   <ul>
 
+</ul>
+
+  <li><a href="#ispointer">IsPointer</a></li>
+  <ul>
+
 </ul>
 
 </ul>
@@ -2181,6 +2268,11 @@ <h3>Contenidos</h3>
   <li><a href="#getip">GetIP</a></li>
   <ul>
 
+</ul>
+
+  <li><a href="#getrequestorigin">GetRequestOrigin</a></li>
+  <ul>
+
 </ul>
 
   <li><a href="#isvalidurl">IsValidURL</a></li>
@@ -2206,6 +2298,16 @@ <h3>Contenidos</h3>
   <li><a href="#removeprotocolandwwwfromurl">RemoveProtocolAndWWWFromURL</a></li>
   <ul>
 
+</ul>
+
+  <li><a href="#nginx-return-444">Nginx return 444</a></li>
+  <ul>
+
+</ul>
+
+  <li><a href="#slow-response">Slow Response</a></li>
+  <ul>
+
 </ul>
 
 </ul>
@@ -2372,7 +2474,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.251456+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.369573+00:00
   -->
 </body>
 

diff --git a/www/golang/index.html b/www/golang/index.html
@@ -3125,7 +3125,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.265657+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.374695+00:00
   -->
 </body>
 

diff --git a/www/html/index.html b/www/html/index.html
@@ -1282,7 +1282,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.292052+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.388722+00:00
   -->
 </body>
 

diff --git a/www/index.html b/www/index.html
@@ -370,7 +370,7 @@ <h3>Quick search</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.175601+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.335019+00:00
   -->
 </body>
 

diff --git a/www/javascript-apis/index.html b/www/javascript-apis/index.html
@@ -1622,7 +1622,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.300788+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.394065+00:00
   -->
 </body>
 

diff --git a/www/javascript-para-web/index.html b/www/javascript-para-web/index.html
@@ -1736,7 +1736,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.310242+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.401772+00:00
   -->
 </body>
 

diff --git a/www/javascript-snippets/index.html b/www/javascript-snippets/index.html
@@ -1070,7 +1070,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.332687+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.411797+00:00
   -->
 </body>
 

diff --git a/www/javascript/index.html b/www/javascript/index.html
@@ -2287,7 +2287,7 @@ <h3>Contenidos</h3>
 
   <!--
   MkDocs version      : 1.4.2
-  Docs Build Date UTC : 2024-10-04 13:57:34.337295+00:00
+  Docs Build Date UTC : 2024-10-07 20:02:36.414807+00:00
   -->
 </body>
-Original file line number
+Diff line change
@@ Expand Up / @@ -384,7 +384,7 @@ <h3>Contenidos</h3> @@
       <!--
       MkDocs version      : 1.4.2
-      Docs Build Date UTC : 2024-10-04 13:57:34.134713+00:00
+      Docs Build Date UTC : 2024-10-07 20:02:36.313159+00:00
       -->
     </body>
@@ Expand Down @@