diff --git a/src/main/java/ext/Ext.kt b/src/main/java/ext/Ext.kt
index 9671ac8b..69c97184 100644
--- a/src/main/java/ext/Ext.kt
+++ b/src/main/java/ext/Ext.kt
@@ -6,6 +6,8 @@ import io.ktor.client.engine.cio.*
 import io.ktor.client.plugins.contentnegotiation.*
 import io.ktor.serialization.kotlinx.json.*
 import jakarta.persistence.Query
+import jakarta.servlet.http.HttpServletRequest
+import jakarta.servlet.http.HttpServletResponse
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import org.apache.tika.Tika
@@ -44,6 +46,19 @@ typealias JavaSerializable = java.io.Serializable
 typealias JDict = Map<String, Any?>
 typealias MutJDict = MutableMap<String, Any?>
 
+fun HttpServletRequest.details() = mapOf(
+    "method" to method,
+    "uri" to requestURI,
+    "query" to queryString,
+    "remote" to remoteAddr,
+    "headers" to headerNames.asSequence().associateWith { getHeader(it) }
+)
+
+fun HttpServletResponse.details() = mapOf(
+    "status" to status,
+    "headers" to headerNames.asSequence().associateWith { getHeader(it) },
+)
+
 @Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION, AnnotationTarget.PROPERTY, AnnotationTarget.PROPERTY_GETTER)
 @Retention(AnnotationRetention.RUNTIME)
 annotation class Doc(
diff --git a/src/main/java/icu/samnyan/aqua/sega/general/filter/CompressionFilter.kt b/src/main/java/icu/samnyan/aqua/sega/general/filter/CompressionFilter.kt
index 4bae4d60..b71967e8 100644
--- a/src/main/java/icu/samnyan/aqua/sega/general/filter/CompressionFilter.kt
+++ b/src/main/java/icu/samnyan/aqua/sega/general/filter/CompressionFilter.kt
@@ -1,6 +1,8 @@
 package icu.samnyan.aqua.sega.general.filter
 
+import ext.details
 import ext.logger
+import ext.toJson
 import icu.samnyan.aqua.sega.util.ZLib
 import jakarta.servlet.FilterChain
 import jakarta.servlet.http.HttpServletRequest
@@ -35,9 +37,21 @@ class CompressionFilter : OncePerRequestFilter() {
         }
 
         // Handle request
-        val result = ContentCachingResponseWrapper(resp).run {
-            chain.doFilter(CompressRequestWrapper(req, reqSrc), this)
-            ZLib.compress(contentAsByteArray).let { if (isDfi) b64e.encode(it) else it }
+        val respW = ContentCachingResponseWrapper(resp)
+        val result = try {
+            chain.doFilter(CompressRequestWrapper(req, reqSrc), respW)
+            ZLib.compress(respW.contentAsByteArray).let { if (isDfi) b64e.encode(it) else it }
+        } finally {
+            if (respW.status != 200) {
+                val details = mapOf(
+                    "req" to req.details(),
+                    "resp" to respW.details(),
+                    "body" to reqSrc.toString(Charsets.UTF_8),
+                    "result" to respW.contentAsByteArray.toString(Charsets.UTF_8)
+                ).toJson()
+
+                log.error("HTTP ${respW.status}: $details")
+            }
         }
 
         // Write response