diff --git a/nise-backend/src/main/kotlin/com/nisemoe/nise/controller/UserDetailsController.kt b/nise-backend/src/main/kotlin/com/nisemoe/nise/controller/UserDetailsController.kt
index 28103e1..d763b8c 100644
--- a/nise-backend/src/main/kotlin/com/nisemoe/nise/controller/UserDetailsController.kt
+++ b/nise-backend/src/main/kotlin/com/nisemoe/nise/controller/UserDetailsController.kt
@@ -50,9 +50,13 @@ class UserDetailsController(
             ResponseEntity.badRequest().build()
     }
 
-    @GetMapping("user-details/{userId}")
-    fun getUserDetails(@PathVariable userId: String): ResponseEntity<UserDetailsResponse> {
-        val userDetails = this.userService.getUserDetails(username = userId)
+    data class UserDetailsRequest(
+        val userId: String
+    )
+
+    @PostMapping("user-details")
+    fun getUserDetails(@RequestBody request: UserDetailsRequest): ResponseEntity<UserDetailsResponse> {
+        val userDetails = this.userService.getUserDetails(username = request.userId)
             ?: return ResponseEntity.notFound().build()
 
         var suspiciousScoresCondition = this.scoreService.getDefaultCondition()
diff --git a/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApi.kt b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApi.kt
index dd9db3f..514284e 100644
--- a/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApi.kt
+++ b/nise-backend/src/main/kotlin/com/nisemoe/nise/osu/OsuApi.kt
@@ -10,9 +10,11 @@ import org.springframework.beans.factory.InitializingBean
 import org.springframework.beans.factory.annotation.Value
 import org.springframework.stereotype.Service
 import java.net.URI
+import java.net.URLEncoder
 import java.net.http.HttpClient
 import java.net.http.HttpRequest
 import java.net.http.HttpResponse
+import java.nio.charset.StandardCharsets
 import java.util.concurrent.atomic.AtomicInteger
 
 class InvalidOsuApiKeyException() : Exception()
@@ -228,7 +230,7 @@ class OsuApi(
         val accessToken = this.tokenService.getAccessToken()
 
         val encodedUserId = userId.replace(' ', '_')
-        val uriBuilder = StringBuilder("https://osu.ppy.sh/api/v2/users/$encodedUserId")
+        val uriBuilder = StringBuilder("https://osu.ppy.sh/api/v2/users/${URLEncoder.encode(encodedUserId, StandardCharsets.UTF_8.toString())}")
 
         if (mode != null) uriBuilder.append("/$mode")
         if (key != null) uriBuilder.append("?key=$key")
diff --git a/nise-frontend/src/app/view-user/view-user.component.ts b/nise-frontend/src/app/view-user/view-user.component.ts
index d30259c..371bace 100644
--- a/nise-frontend/src/app/view-user/view-user.component.ts
+++ b/nise-frontend/src/app/view-user/view-user.component.ts
@@ -68,7 +68,10 @@ export class ViewUserComponent implements OnInit, OnChanges, OnDestroy {
   ) { }
 
   getUserInfo(): Observable<UserInfo> {
-    return this.httpClient.get<UserInfo>(`${environment.apiUrl}/user-details/${this.userId}`);
+    const body = {
+      userId: this.userId
+    }
+    return this.httpClient.post<UserInfo>(`${environment.apiUrl}/user-details`, body);
   }
 
   ngOnChanges(): void {