diff --git a/README.md b/README.md
index 24e06ff..af8750b 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ### Latest versions
 
-* Latest stable version: `1.3.0`
+* Latest stable version: `1.3.1`
    * Now with 100% more virtual threads!
 * Prior stable version `0.3.7` 
 
@@ -27,20 +27,20 @@ To add this library to your project, you can include this dependency in your Mav
 <dependency>
   <groupId>io.fusionauth</groupId>
   <artifactId>java-http</artifactId>
-  <version>1.3.0</version>
+  <version>1.3.1</version>
 </dependency>
 ```
 
 If you are using Gradle, you can add this to your build file:
 
 ```groovy
-implementation 'io.fusionauth:java-http:1.3.0'
+implementation 'io.fusionauth:java-http:1.3.1'
 ```
 
 If you are using Savant, you can add this to your build file:
 
 ```groovy
-dependency(id: "io.fusionauth:java-http:1.3.0")
+dependency(id: "io.fusionauth:java-http:1.3.1")
 ```
 
 ## Examples Usages:
diff --git a/build.savant b/build.savant
index 8f0013d..06b51d2 100644
--- a/build.savant
+++ b/build.savant
@@ -18,7 +18,7 @@ restifyVersion = "4.2.1"
 slf4jVersion = "2.0.17"
 testngVersion = "7.11.0"
 
-project(group: "io.fusionauth", name: "java-http", version: "1.3.0", licenses: ["ApacheV2_0"]) {
+project(group: "io.fusionauth", name: "java-http", version: "1.3.1", licenses: ["ApacheV2_0"]) {
   workflow {
     fetch {
       // Dependency resolution order:
diff --git a/src/main/java/io/fusionauth/http/Cookie.java b/src/main/java/io/fusionauth/http/Cookie.java
index 1fd82c1..8b9cca0 100644
--- a/src/main/java/io/fusionauth/http/Cookie.java
+++ b/src/main/java/io/fusionauth/http/Cookie.java
@@ -19,6 +19,7 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 
@@ -245,7 +246,7 @@ public void addAttribute(String name, String value) {
       return;
     }
 
-    switch (name.toLowerCase()) {
+    switch (name.toLowerCase(Locale.ROOT)) {
       case HTTPValues.CookieAttributes.DomainLower:
         domain = value;
         break;
diff --git a/src/main/java/io/fusionauth/http/io/MultipartStream.java b/src/main/java/io/fusionauth/http/io/MultipartStream.java
index 478c878..283875c 100644
--- a/src/main/java/io/fusionauth/http/io/MultipartStream.java
+++ b/src/main/java/io/fusionauth/http/io/MultipartStream.java
@@ -27,6 +27,7 @@
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 
@@ -264,7 +265,7 @@ private void readHeaders(Map<String, HeaderValue> headers) throws IOException, P
       var nextState = state.next(b);
       if (nextState != state) {
         switch (state) {
-          case HeaderName -> headerName = build.toString().toLowerCase();
+          case HeaderName -> headerName = build.toString().toLowerCase(Locale.ROOT);
           case HeaderValue -> headers.put(headerName, HTTPTools.parseHeaderValue(build.toString()));
         }
 
diff --git a/src/main/java/io/fusionauth/http/server/HTTPRequest.java b/src/main/java/io/fusionauth/http/server/HTTPRequest.java
index 3877369..be5651a 100644
--- a/src/main/java/io/fusionauth/http/server/HTTPRequest.java
+++ b/src/main/java/io/fusionauth/http/server/HTTPRequest.java
@@ -164,13 +164,13 @@ public void addCookies(Collection<Cookie> cookies) {
   }
 
   public void addHeader(String name, String value) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     headers.computeIfAbsent(name, key -> new ArrayList<>()).add(value);
     decodeHeader(name, value);
   }
 
   public void addHeaders(String name, String... values) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     headers.computeIfAbsent(name, key -> new ArrayList<>()).addAll(List.of(values));
 
     for (String value : values) {
@@ -179,7 +179,7 @@ public void addHeaders(String name, String... values) {
   }
 
   public void addHeaders(String name, Collection<String> values) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     headers.computeIfAbsent(name, key -> new ArrayList<>()).addAll(values);
 
     for (String value : values) {
@@ -254,12 +254,12 @@ public Map<String, Object> getAttributes() {
   public String getBaseURL() {
     // Setting the wrong value in the X-Forwarded-Proto header seems to be a common issue that causes an exception during URI.create.
     // Assuming request.getScheme() is not the problem, and it is related to the proxy configuration.
-    String scheme = getScheme().toLowerCase();
+    String scheme = getScheme().toLowerCase(Locale.ROOT);
     if (!scheme.equalsIgnoreCase("http") && !scheme.equalsIgnoreCase("https")) {
       throw new IllegalArgumentException("The request scheme is invalid. Only http or https are valid schemes. The X-Forwarded-Proto header has a value of [" + getHeader(Headers.XForwardedProto) + "], this is likely an issue in your proxy configuration.");
     }
 
-    String serverName = getHost().toLowerCase();
+    String serverName = getHost().toLowerCase(Locale.ROOT);
     int serverPort = getBaseURLServerPort();
 
     String uri = scheme + "://" + serverName;
@@ -381,7 +381,7 @@ public String getHeader(String name) {
   }
 
   public List<String> getHeaders(String name) {
-    return headers.get(name.toLowerCase());
+    return headers.get(name.toLowerCase(Locale.ROOT));
   }
 
   public Map<String, List<String>> getHeaders() {
@@ -650,11 +650,11 @@ public Object removeAttribute(String name) {
   }
 
   public void removeHeader(String name) {
-    headers.remove(name.toLowerCase());
+    headers.remove(name.toLowerCase(Locale.ROOT));
   }
 
   public void removeHeader(String name, String... values) {
-    List<String> actual = headers.get(name.toLowerCase());
+    List<String> actual = headers.get(name.toLowerCase(Locale.ROOT));
     if (actual != null) {
       actual.removeAll(List.of(values));
     }
@@ -671,13 +671,13 @@ public void setAttribute(String name, Object value) {
   }
 
   public void setHeader(String name, String value) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     this.headers.put(name, new ArrayList<>(List.of(value)));
     decodeHeader(name, value);
   }
 
   public void setHeaders(String name, String... values) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     this.headers.put(name, new ArrayList<>(List.of(values)));
 
     for (String value : values) {
@@ -686,7 +686,7 @@ public void setHeaders(String name, String... values) {
   }
 
   public void setHeaders(String name, Collection<String> values) {
-    name = name.toLowerCase();
+    name = name.toLowerCase(Locale.ROOT);
     this.headers.put(name, new ArrayList<>(values));
 
     for (String value : values) {
diff --git a/src/main/java/io/fusionauth/http/server/HTTPResponse.java b/src/main/java/io/fusionauth/http/server/HTTPResponse.java
index 874111f..56bcda3 100644
--- a/src/main/java/io/fusionauth/http/server/HTTPResponse.java
+++ b/src/main/java/io/fusionauth/http/server/HTTPResponse.java
@@ -27,6 +27,7 @@
 import java.util.HashMap;
 import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.stream.Collectors;
 
@@ -82,7 +83,7 @@ public void addHeader(String name, String value) {
       return;
     }
 
-    headers.computeIfAbsent(name.toLowerCase(), key -> new ArrayList<>()).add(value);
+    headers.computeIfAbsent(name.toLowerCase(Locale.ROOT), key -> new ArrayList<>()).add(value);
   }
 
   public void clearHeaders() {
@@ -102,7 +103,7 @@ public void close() throws IOException {
   }
 
   public boolean containsHeader(String name) {
-    String key = name.toLowerCase();
+    String key = name.toLowerCase(Locale.ROOT);
     return headers.containsKey(key) && !headers.get(key).isEmpty();
   }
 
@@ -174,12 +175,12 @@ public void setException(Throwable exception) {
   }
 
   public String getHeader(String name) {
-    String key = name.toLowerCase();
+    String key = name.toLowerCase(Locale.ROOT);
     return headers.containsKey(key) && !headers.get(key).isEmpty() ? headers.get(key).getFirst() : null;
   }
 
   public List<String> getHeaders(String key) {
-    return headers.get(key.toLowerCase());
+    return headers.get(key.toLowerCase(Locale.ROOT));
   }
 
   public Map<String, List<String>> getHeadersMap() {
@@ -260,7 +261,7 @@ public void removeCookie(String name) {
    */
   public void removeHeader(String name) {
     if (name != null) {
-      headers.remove(name.toLowerCase());
+      headers.remove(name.toLowerCase(Locale.ROOT));
     }
   }
 
@@ -304,7 +305,7 @@ public void setHeader(String name, String value) {
       return;
     }
 
-    headers.put(name.toLowerCase(), new ArrayList<>(List.of(value)));
+    headers.put(name.toLowerCase(Locale.ROOT), new ArrayList<>(List.of(value)));
   }
 
   /**
diff --git a/src/main/java/io/fusionauth/http/server/HTTPServerConfiguration.java b/src/main/java/io/fusionauth/http/server/HTTPServerConfiguration.java
index 966b9fc..b04c168 100644
--- a/src/main/java/io/fusionauth/http/server/HTTPServerConfiguration.java
+++ b/src/main/java/io/fusionauth/http/server/HTTPServerConfiguration.java
@@ -20,6 +20,7 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 
@@ -493,7 +494,8 @@ public HTTPServerConfiguration withMaxRequestBodySize(Map<String, Integer> maxRe
     this.maxRequestBodySize.clear();
     // Add back a default to ensure we always have a fallback, can still be modified by the incoming configuration.
     this.maxRequestBodySize.put("*", DefaultMaxRequestSizes.get("*"));
-    this.maxRequestBodySize.putAll(maxRequestBodySize);
+    // Store lower case keys
+    maxRequestBodySize.forEach((k, v) -> this.maxRequestBodySize.put(k.toLowerCase(Locale.ROOT), v));
     return this;
   }
 
diff --git a/src/main/java/io/fusionauth/http/server/internal/HTTPWorker.java b/src/main/java/io/fusionauth/http/server/internal/HTTPWorker.java
index 8267a2f..1ae36ff 100644
--- a/src/main/java/io/fusionauth/http/server/internal/HTTPWorker.java
+++ b/src/main/java/io/fusionauth/http/server/internal/HTTPWorker.java
@@ -234,8 +234,8 @@ public void run() {
       logger.trace("[{}] Closing socket. Client closed the connection. Reason [{}].", Thread.currentThread().threadId(), e.getMessage());
       closeSocketOnly(CloseSocketReason.Expected);
     } catch (HTTPProcessingException e) {
-      // Note that I am only tracing this, because this exception is mostly expected. Use closeSocketOnError so we can attempt to write a response.
-      logger.trace("[{}] Closing socket with status [{}]. An unhandled [{}] exception was taken. Reason [{}].", Thread.currentThread().threadId(), e.getStatus(), e.getClass().getSimpleName(), e.getMessage());
+      // These are expected, but are things the client may want to know about. Use closeSocketOnError so we can attempt to write a response.
+      logger.debug("[{}] Closing socket with status [{}]. An unhandled [{}] exception was taken. Reason [{}].", Thread.currentThread().threadId(), e.getStatus(), e.getClass().getSimpleName(), e.getMessage());
       closeSocketOnError(response, e.getStatus());
     } catch (TooManyBytesToDrainException e) {
       // The request handler did not read the entire InputStream, we tried to drain it but there were more bytes remaining than the configured maximum.
diff --git a/src/main/java/io/fusionauth/http/util/HTTPTools.java b/src/main/java/io/fusionauth/http/util/HTTPTools.java
index 3e9625d..d49b328 100644
--- a/src/main/java/io/fusionauth/http/util/HTTPTools.java
+++ b/src/main/java/io/fusionauth/http/util/HTTPTools.java
@@ -26,6 +26,7 @@
 import java.util.HexFormat;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 
@@ -58,6 +59,7 @@ public static int getMaxRequestBodySize(String contentType, Map<String, Integer>
     }
 
     // Exact match
+    contentType = contentType.toLowerCase(Locale.ROOT);
     Integer maximumSize = maxRequestBodySize.get(contentType);
     if (maximumSize != null) {
       return maximumSize;
@@ -426,10 +428,10 @@ private static void parseHeaderParameter(char[] chars, int start, int end, Map<S
     for (int i = start; i < end; i++) {
       if (name == null && chars[i] == '*') {
         encoded = true;
-        name = new String(chars, start, i - start).toLowerCase();
+        name = new String(chars, start, i - start).toLowerCase(Locale.ROOT);
         start = i + 2;
       } else if (name == null && chars[i] == '=') {
-        name = new String(chars, start, i - start).toLowerCase();
+        name = new String(chars, start, i - start).toLowerCase(Locale.ROOT);
         start = i + 1;
       } else if (name != null && encoded && charset == null && chars[i] == '\'') {
         String charsetName = new String(chars, start, i - start);
diff --git a/src/test/java/io/fusionauth/http/FormDataTest.java b/src/test/java/io/fusionauth/http/FormDataTest.java
index 3c2dcac..8792ea1 100644
--- a/src/test/java/io/fusionauth/http/FormDataTest.java
+++ b/src/test/java/io/fusionauth/http/FormDataTest.java
@@ -23,6 +23,7 @@
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.function.Consumer;
 
@@ -76,7 +77,8 @@ public void post_server_configuration_max_form_data(String scheme, boolean chunk
         .withBodyParameterCount(42 * 1024)
         .withBodyParameterSize(128)
         // 4k * 33 > 128k
-        .withConfiguration(config -> config.withMaxRequestBodySize(Map.of(ContentTypes.Form, 128 * 1024)))
+        // - Use a UC Content-Type to make sure it still works
+        .withConfiguration(config -> config.withMaxRequestBodySize(Map.of(ContentTypes.Form.toUpperCase(Locale.ROOT), 128 * 1024)))
         .expectResponse("""
             HTTP/1.1 413 \r
             connection: close\r
diff --git a/src/test/java/io/fusionauth/http/util/HTTPToolsTest.java b/src/test/java/io/fusionauth/http/util/HTTPToolsTest.java
index e3081b0..50f2e47 100644
--- a/src/test/java/io/fusionauth/http/util/HTTPToolsTest.java
+++ b/src/test/java/io/fusionauth/http/util/HTTPToolsTest.java
@@ -22,6 +22,7 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 
 import com.inversoft.json.ToString;
@@ -64,6 +65,9 @@ public void getMaxRequestBodySize() {
     assertMaxConfiguredSize("text/css", 6, configuration);
     assertMaxConfiguredSize("text/html", 7, configuration);
 
+    // Mixed case
+    assertMaxConfiguredSize("Application/JSON", 3, configuration);
+
     // We don't expect this at runtime, but ideally we won't explode. These would be invalid values.
     // - Some of these are legit Content-Type headers, but at runtime we will have already parsed the header so we do
     //   not expect any attributes;
@@ -283,7 +287,7 @@ private String hex(byte[] bytes) {
     List<String> result = new ArrayList<>();
     for (byte b : bytes) {
 
-      result.add(Integer.toHexString(0xFF & b).toUpperCase());
+      result.add(Integer.toHexString(0xFF & b).toUpperCase(Locale.ROOT));
     }
     return String.join(" ", result);
   }
@@ -291,7 +295,7 @@ private String hex(byte[] bytes) {
   private String hex(String s) {
     List<String> result = new ArrayList<>();
     for (char ch : s.toCharArray()) {
-      result.add(Integer.toHexString(ch).toUpperCase());
+      result.add(Integer.toHexString(ch).toUpperCase(Locale.ROOT));
     }
     return String.join(" ", result);
   }