diff --git a/litellm/llms/deepseek/chat/transformation.py b/litellm/llms/deepseek/chat/transformation.py
index 4e428a23392..7b68d6837f1 100644
--- a/litellm/llms/deepseek/chat/transformation.py
+++ b/litellm/llms/deepseek/chat/transformation.py
@@ -363,10 +363,9 @@ class DeepSeekChatConfig(OpenAIGPTConfig):
         """
         If api_base is not provided, use the default DeepSeek /chat/completions endpoint.
         """
-        if not api_base:
-            api_base = "https://api.deepseek.com/beta"
+        clean_api_base: Final = (api_base or "https://api.deepseek.com/beta").rstrip("/")
 
-        if not api_base.endswith("/chat/completions"):
-            api_base = f"{api_base}/chat/completions"
+        if not clean_api_base.endswith("/chat/completions"):
+            return f"{clean_api_base}/chat/completions"
 
-        return api_base
+        return clean_api_base
diff --git a/litellm/llms/heroku/chat/transformation.py b/litellm/llms/heroku/chat/transformation.py
index fd0c29b080b..546424a7e4c 100644
--- a/litellm/llms/heroku/chat/transformation.py
+++ b/litellm/llms/heroku/chat/transformation.py
@@ -6,7 +6,7 @@ this is OpenAI compatible - no translation needed / occurs
 
 import os
 from collections.abc import Coroutine
-from typing import Any, Literal, overload
+from typing import Any, Final, Literal, overload
 
 from litellm.litellm_core_utils.prompt_templates.common_utils import (
     handle_messages_with_content_list_to_str_conversion,
@@ -64,14 +64,16 @@ class HerokuChatConfig(OpenAIGPTConfig):
         litellm_params: dict,
         stream: bool | None = None,
     ) -> str:
-        api_base, _ = self._get_openai_compatible_provider_info(api_base, api_key)
+        resolved_base, _ = self._get_openai_compatible_provider_info(api_base, api_key)
 
-        if not api_base:
+        if not resolved_base:
             raise HerokuError(
                 "No api base was set. Please provide an api_base, or set the HEROKU_API_BASE environment variable."
             )
 
-        if not api_base.endswith("/v1/chat/completions"):
-            api_base = f"{api_base}/v1/chat/completions"
+        clean_api_base: Final = resolved_base.rstrip("/")
 
-        return api_base
+        if not clean_api_base.endswith("/v1/chat/completions"):
+            return f"{clean_api_base}/v1/chat/completions"
+
+        return clean_api_base
diff --git a/litellm/llms/jina_ai/embedding/transformation.py b/litellm/llms/jina_ai/embedding/transformation.py
index 260d9e6e494..37d791701fc 100644
--- a/litellm/llms/jina_ai/embedding/transformation.py
+++ b/litellm/llms/jina_ai/embedding/transformation.py
@@ -95,7 +95,12 @@ class JinaAIEmbeddingConfig(BaseEmbeddingConfig):
         litellm_params: dict,
         stream: bool | None = None,
     ) -> str:
-        return f"{api_base}/embeddings" if api_base else "https://api.jina.ai/v1/embeddings"
+        if api_base:
+            clean_api_base: Final = api_base.rstrip("/")
+            if not clean_api_base.endswith("/embeddings"):
+                return f"{clean_api_base}/embeddings"
+            return clean_api_base
+        return "https://api.jina.ai/v1/embeddings"
 
     def transform_embedding_request(
         self,
diff --git a/litellm/llms/modelscope/chat/transformation.py b/litellm/llms/modelscope/chat/transformation.py
index d345b8efc56..2f4855f6513 100644
--- a/litellm/llms/modelscope/chat/transformation.py
+++ b/litellm/llms/modelscope/chat/transformation.py
@@ -79,10 +79,9 @@ class ModelScopeChatConfig(OpenAIGPTConfig):
         """
         If api_base is not provided, use the default ModelScope /chat/completions endpoint.
         """
-        if not api_base:
-            api_base = self.DEFAULT_BASE_URL
+        clean_api_base: Final = (api_base or self.DEFAULT_BASE_URL).rstrip("/")
 
-        if not api_base.endswith("/chat/completions"):
-            api_base = f"{api_base}/chat/completions"
+        if not clean_api_base.endswith("/chat/completions"):
+            return f"{clean_api_base}/chat/completions"
 
-        return api_base
+        return clean_api_base
diff --git a/litellm/llms/moonshot/chat/transformation.py b/litellm/llms/moonshot/chat/transformation.py
index 7b0fcd24770..a6b546ae4e2 100644
--- a/litellm/llms/moonshot/chat/transformation.py
+++ b/litellm/llms/moonshot/chat/transformation.py
@@ -86,13 +86,12 @@ class MoonshotChatConfig(OpenAIGPTConfig):
         """
         If api_base is not provided, use the default Moonshot AI /chat/completions endpoint.
         """
-        if not api_base:
-            api_base = "https://api.moonshot.ai/v1"
+        clean_api_base: Final = (api_base or "https://api.moonshot.ai/v1").rstrip("/")
 
-        if not api_base.endswith("/chat/completions"):
-            api_base = f"{api_base}/chat/completions"
+        if not clean_api_base.endswith("/chat/completions"):
+            return f"{clean_api_base}/chat/completions"
 
-        return api_base
+        return clean_api_base
 
     def get_supported_openai_params(self, model: str) -> list:
         """
diff --git a/litellm/llms/ollama/chat/transformation.py b/litellm/llms/ollama/chat/transformation.py
index cb3080e6534..862db62d9df 100644
--- a/litellm/llms/ollama/chat/transformation.py
+++ b/litellm/llms/ollama/chat/transformation.py
@@ -218,14 +218,10 @@ class OllamaChatConfig(BaseConfig):
 
         Some providers need `model` in `api_base`
         """
-        if api_base is None:
-            api_base = "http://localhost:11434"
-        if api_base.endswith("/api/chat"):
-            url = api_base
-        else:
-            url = f"{api_base}/api/chat"
-
-        return url
+        clean_api_base: Final = (api_base or "http://localhost:11434").rstrip("/")
+        if clean_api_base.endswith("/api/chat"):
+            return clean_api_base
+        return f"{clean_api_base}/api/chat"
 
     def transform_request(
         self,
diff --git a/litellm/llms/ollama/completion/transformation.py b/litellm/llms/ollama/completion/transformation.py
index b1f69220de7..7e5b24f9db8 100644
--- a/litellm/llms/ollama/completion/transformation.py
+++ b/litellm/llms/ollama/completion/transformation.py
@@ -468,14 +468,10 @@ class OllamaConfig(BaseConfig):
 
         Some providers need `model` in `api_base`
         """
-        if api_base is None:
-            api_base = "http://localhost:11434"
-        if api_base.endswith("/api/generate"):
-            url = api_base
-        else:
-            url = f"{api_base}/api/generate"
-
-        return url
+        clean_api_base: Final = (api_base or "http://localhost:11434").rstrip("/")
+        if clean_api_base.endswith("/api/generate"):
+            return clean_api_base
+        return f"{clean_api_base}/api/generate"
 
     def get_model_response_iterator(
         self,
diff --git a/litellm/llms/perplexity/embedding/transformation.py b/litellm/llms/perplexity/embedding/transformation.py
index c93206db2bb..0e6de725c37 100644
--- a/litellm/llms/perplexity/embedding/transformation.py
+++ b/litellm/llms/perplexity/embedding/transformation.py
@@ -61,9 +61,10 @@ class PerplexityEmbeddingConfig(BaseEmbeddingConfig):
         stream: bool | None = None,
     ) -> str:
         if api_base:
-            if not api_base.endswith("/embeddings"):
-                api_base = f"{api_base}/v1/embeddings"
-            return api_base
+            clean_api_base: Final = api_base.rstrip("/")
+            if not clean_api_base.endswith("/embeddings"):
+                return f"{clean_api_base}/v1/embeddings"
+            return clean_api_base
         return "https://api.perplexity.ai/v1/embeddings"
 
     def get_supported_openai_params(self, model: str) -> list:
diff --git a/litellm/llms/topaz/image_variations/transformation.py b/litellm/llms/topaz/image_variations/transformation.py
index 94f60d29cb9..8d03b73e94e 100644
--- a/litellm/llms/topaz/image_variations/transformation.py
+++ b/litellm/llms/topaz/image_variations/transformation.py
@@ -39,8 +39,8 @@ class TopazImageVariationConfig(TopazModelInfo, BaseImageVariationConfig):
         litellm_params: dict,
         stream: bool | None = None,
     ) -> str:
-        api_base = api_base or "https://api.topazlabs.com"
-        return f"{api_base}/image/v1/enhance"
+        clean_api_base: Final = (api_base or "https://api.topazlabs.com").rstrip("/")
+        return f"{clean_api_base}/image/v1/enhance"
 
     def map_openai_params(
         self,
diff --git a/litellm/llms/voyage/embedding/transformation.py b/litellm/llms/voyage/embedding/transformation.py
index 7d74b1e00c4..8f52c1bb773 100644
--- a/litellm/llms/voyage/embedding/transformation.py
+++ b/litellm/llms/voyage/embedding/transformation.py
@@ -46,9 +46,10 @@ class VoyageEmbeddingConfig(BaseEmbeddingConfig):
         stream: bool | None = None,
     ) -> str:
         if api_base:
-            if not api_base.endswith("/embeddings"):
-                api_base = f"{api_base}/embeddings"
-            return api_base
+            clean_api_base: Final = api_base.rstrip("/")
+            if not clean_api_base.endswith("/embeddings"):
+                return f"{clean_api_base}/embeddings"
+            return clean_api_base
         return "https://api.voyageai.com/v1/embeddings"
 
     def get_supported_openai_params(self, model: str) -> list:
diff --git a/litellm/llms/voyage/embedding/transformation_contextual.py b/litellm/llms/voyage/embedding/transformation_contextual.py
index 870de8756bb..4c97301fe29 100644
--- a/litellm/llms/voyage/embedding/transformation_contextual.py
+++ b/litellm/llms/voyage/embedding/transformation_contextual.py
@@ -55,9 +55,10 @@ class VoyageContextualEmbeddingConfig(BaseEmbeddingConfig):
         stream: bool | None = None,
     ) -> str:
         if api_base:
-            if not api_base.endswith("/contextualizedembeddings"):
-                api_base = f"{api_base}/contextualizedembeddings"
-            return api_base
+            clean_api_base: Final = api_base.rstrip("/")
+            if not clean_api_base.endswith("/contextualizedembeddings"):
+                return f"{clean_api_base}/contextualizedembeddings"
+            return clean_api_base
         return "https://api.voyageai.com/v1/contextualizedembeddings"
 
     def get_supported_openai_params(self, model: str) -> list:  # mutable-ok: base class signature
diff --git a/litellm/llms/voyage/embedding/transformation_multimodal.py b/litellm/llms/voyage/embedding/transformation_multimodal.py
index 814d5ab7eb0..ba5658e0568 100644
--- a/litellm/llms/voyage/embedding/transformation_multimodal.py
+++ b/litellm/llms/voyage/embedding/transformation_multimodal.py
@@ -55,9 +55,10 @@ class VoyageMultimodalEmbeddingConfig(BaseEmbeddingConfig):
         stream: bool | None = None,
     ) -> str:
         if api_base:
-            if not api_base.endswith("/multimodalembeddings"):
-                api_base = f"{api_base}/multimodalembeddings"
-            return api_base
+            clean_api_base: Final = api_base.rstrip("/")
+            if not clean_api_base.endswith("/multimodalembeddings"):
+                return f"{clean_api_base}/multimodalembeddings"
+            return clean_api_base
         return "https://api.voyageai.com/v1/multimodalembeddings"
 
     def get_supported_openai_params(self, model: str) -> list:
diff --git a/tests/test_litellm/llms/test_provider_url_trailing_slash.py b/tests/test_litellm/llms/test_provider_url_trailing_slash.py
new file mode 100644
index 00000000000..47fdb84db81
--- /dev/null
+++ b/tests/test_litellm/llms/test_provider_url_trailing_slash.py
@@ -0,0 +1,418 @@
+from litellm.llms.deepseek.chat.transformation import DeepSeekChatConfig
+from litellm.llms.heroku.chat.transformation import HerokuChatConfig
+from litellm.llms.jina_ai.embedding.transformation import JinaAIEmbeddingConfig
+from litellm.llms.modelscope.chat.transformation import ModelScopeChatConfig
+from litellm.llms.moonshot.chat.transformation import MoonshotChatConfig
+from litellm.llms.ollama.chat.transformation import OllamaChatConfig
+from litellm.llms.ollama.completion.transformation import OllamaConfig
+from litellm.llms.perplexity.embedding.transformation import PerplexityEmbeddingConfig
+from litellm.llms.topaz.image_variations.transformation import TopazImageVariationConfig
+from litellm.llms.voyage.embedding.transformation import VoyageEmbeddingConfig
+from litellm.llms.voyage.embedding.transformation_contextual import VoyageContextualEmbeddingConfig
+from litellm.llms.voyage.embedding.transformation_multimodal import VoyageMultimodalEmbeddingConfig
+
+
+def test_deepseek_get_complete_url_trailing_slash():
+    config = DeepSeekChatConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://custom.deepseek.com",
+        api_key=None,
+        model="deepseek-chat",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://custom.deepseek.com/",
+        api_key=None,
+        model="deepseek-chat",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://custom.deepseek.com/chat/completions/",
+        api_key=None,
+        model="deepseek-chat",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="deepseek-chat",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://custom.deepseek.com/chat/completions"
+    assert url_with_slash == "https://custom.deepseek.com/chat/completions"
+    assert url_with_endpoint == "https://custom.deepseek.com/chat/completions"
+    assert url_default == "https://api.deepseek.com/beta/chat/completions"
+    assert "//chat/completions" not in url_with_slash
+
+
+def test_ollama_get_complete_url_trailing_slash():
+    chat_config = OllamaChatConfig()
+    url_without_slash = chat_config.get_complete_url(
+        api_base="http://localhost:11434",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = chat_config.get_complete_url(
+        api_base="http://localhost:11434/",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = chat_config.get_complete_url(
+        api_base="http://localhost:11434/api/chat/",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = chat_config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "http://localhost:11434/api/chat"
+    assert url_with_slash == "http://localhost:11434/api/chat"
+    assert url_with_endpoint == "http://localhost:11434/api/chat"
+    assert url_default == "http://localhost:11434/api/chat"
+    assert "//api/chat" not in url_with_slash
+
+    completion_config = OllamaConfig()
+    comp_url_without_slash = completion_config.get_complete_url(
+        api_base="http://localhost:11434",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    comp_url_with_slash = completion_config.get_complete_url(
+        api_base="http://localhost:11434/",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    comp_url_with_endpoint = completion_config.get_complete_url(
+        api_base="http://localhost:11434/api/generate/",
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    comp_url_default = completion_config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="llama3",
+        optional_params={},
+        litellm_params={},
+    )
+    assert comp_url_without_slash == "http://localhost:11434/api/generate"
+    assert comp_url_with_slash == "http://localhost:11434/api/generate"
+    assert comp_url_with_endpoint == "http://localhost:11434/api/generate"
+    assert comp_url_default == "http://localhost:11434/api/generate"
+    assert "//api/generate" not in comp_url_with_slash
+
+
+def test_moonshot_get_complete_url_trailing_slash():
+    config = MoonshotChatConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api.moonshot.ai/v1",
+        api_key=None,
+        model="moonshot-v1-8k",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api.moonshot.ai/v1/",
+        api_key=None,
+        model="moonshot-v1-8k",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://api.moonshot.ai/v1/chat/completions/",
+        api_key=None,
+        model="moonshot-v1-8k",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="moonshot-v1-8k",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api.moonshot.ai/v1/chat/completions"
+    assert url_with_slash == "https://api.moonshot.ai/v1/chat/completions"
+    assert url_with_endpoint == "https://api.moonshot.ai/v1/chat/completions"
+    assert url_default == "https://api.moonshot.ai/v1/chat/completions"
+    assert "//chat/completions" not in url_with_slash
+
+
+def test_modelscope_get_complete_url_trailing_slash():
+    config = ModelScopeChatConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api-inference.modelscope.cn/v1",
+        api_key=None,
+        model="qwen",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api-inference.modelscope.cn/v1/",
+        api_key=None,
+        model="qwen",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://api-inference.modelscope.cn/v1/chat/completions/",
+        api_key=None,
+        model="qwen",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="qwen",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api-inference.modelscope.cn/v1/chat/completions"
+    assert url_with_slash == "https://api-inference.modelscope.cn/v1/chat/completions"
+    assert url_with_endpoint == "https://api-inference.modelscope.cn/v1/chat/completions"
+    assert url_default == "https://api-inference.modelscope.cn/v1/chat/completions"
+    assert "//chat/completions" not in url_with_slash
+
+
+def test_jina_ai_get_complete_url_trailing_slash():
+    config = JinaAIEmbeddingConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api.jina.ai/v1",
+        api_key=None,
+        model="jina-embeddings-v2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api.jina.ai/v1/",
+        api_key=None,
+        model="jina-embeddings-v2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://api.jina.ai/v1/embeddings/",
+        api_key=None,
+        model="jina-embeddings-v2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="jina-embeddings-v2",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api.jina.ai/v1/embeddings"
+    assert url_with_slash == "https://api.jina.ai/v1/embeddings"
+    assert url_with_endpoint == "https://api.jina.ai/v1/embeddings"
+    assert url_default == "https://api.jina.ai/v1/embeddings"
+    assert "//embeddings" not in url_with_slash
+
+
+def test_voyage_get_complete_url_trailing_slash():
+    config = VoyageEmbeddingConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api.voyageai.com/v1",
+        api_key=None,
+        model="voyage-large-2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/",
+        api_key=None,
+        model="voyage-large-2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/embeddings/",
+        api_key=None,
+        model="voyage-large-2",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="voyage-large-2",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api.voyageai.com/v1/embeddings"
+    assert url_with_slash == "https://api.voyageai.com/v1/embeddings"
+    assert url_with_endpoint == "https://api.voyageai.com/v1/embeddings"
+    assert url_default == "https://api.voyageai.com/v1/embeddings"
+    assert "//embeddings" not in url_with_slash
+
+    contextual_config = VoyageContextualEmbeddingConfig()
+    c_url = contextual_config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/",
+        api_key=None,
+        model="voyage-context-2",
+        optional_params={},
+        litellm_params={},
+    )
+    c_url_endpoint = contextual_config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/contextualizedembeddings/",
+        api_key=None,
+        model="voyage-context-2",
+        optional_params={},
+        litellm_params={},
+    )
+    c_url_default = contextual_config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="voyage-context-2",
+        optional_params={},
+        litellm_params={},
+    )
+    assert c_url == "https://api.voyageai.com/v1/contextualizedembeddings"
+    assert c_url_endpoint == "https://api.voyageai.com/v1/contextualizedembeddings"
+    assert c_url_default == "https://api.voyageai.com/v1/contextualizedembeddings"
+    assert "//contextualizedembeddings" not in c_url
+
+    multimodal_config = VoyageMultimodalEmbeddingConfig()
+    m_url = multimodal_config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/",
+        api_key=None,
+        model="voyage-multimodal-3",
+        optional_params={},
+        litellm_params={},
+    )
+    m_url_endpoint = multimodal_config.get_complete_url(
+        api_base="https://api.voyageai.com/v1/multimodalembeddings/",
+        api_key=None,
+        model="voyage-multimodal-3",
+        optional_params={},
+        litellm_params={},
+    )
+    m_url_default = multimodal_config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="voyage-multimodal-3",
+        optional_params={},
+        litellm_params={},
+    )
+    assert m_url == "https://api.voyageai.com/v1/multimodalembeddings"
+    assert m_url_endpoint == "https://api.voyageai.com/v1/multimodalembeddings"
+    assert m_url_default == "https://api.voyageai.com/v1/multimodalembeddings"
+    assert "//multimodalembeddings" not in m_url
+
+
+def test_perplexity_get_complete_url_trailing_slash():
+    config = PerplexityEmbeddingConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api.perplexity.ai",
+        api_key=None,
+        model="sonar-medium",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api.perplexity.ai/",
+        api_key=None,
+        model="sonar-medium",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://api.perplexity.ai/v1/embeddings/",
+        api_key=None,
+        model="sonar-medium",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="sonar-medium",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api.perplexity.ai/v1/embeddings"
+    assert url_with_slash == "https://api.perplexity.ai/v1/embeddings"
+    assert url_with_endpoint == "https://api.perplexity.ai/v1/embeddings"
+    assert url_default == "https://api.perplexity.ai/v1/embeddings"
+    assert "//v1/embeddings" not in url_with_slash
+
+
+def test_heroku_get_complete_url_trailing_slash():
+    config = HerokuChatConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://my-app.herokuapp.com",
+        api_key=None,
+        model="claude-3-5-sonnet",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://my-app.herokuapp.com/",
+        api_key=None,
+        model="claude-3-5-sonnet",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_endpoint = config.get_complete_url(
+        api_base="https://my-app.herokuapp.com/v1/chat/completions/",
+        api_key=None,
+        model="claude-3-5-sonnet",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://my-app.herokuapp.com/v1/chat/completions"
+    assert url_with_slash == "https://my-app.herokuapp.com/v1/chat/completions"
+    assert url_with_endpoint == "https://my-app.herokuapp.com/v1/chat/completions"
+    assert "//v1/chat/completions" not in url_with_slash
+
+
+def test_topaz_get_complete_url_trailing_slash():
+    config = TopazImageVariationConfig()
+    url_without_slash = config.get_complete_url(
+        api_base="https://api.topazlabs.com",
+        api_key=None,
+        model="topaz-v1",
+        optional_params={},
+        litellm_params={},
+    )
+    url_with_slash = config.get_complete_url(
+        api_base="https://api.topazlabs.com/",
+        api_key=None,
+        model="topaz-v1",
+        optional_params={},
+        litellm_params={},
+    )
+    url_default = config.get_complete_url(
+        api_base=None,
+        api_key=None,
+        model="topaz-v1",
+        optional_params={},
+        litellm_params={},
+    )
+    assert url_without_slash == "https://api.topazlabs.com/image/v1/enhance"
+    assert url_with_slash == "https://api.topazlabs.com/image/v1/enhance"
+    assert url_default == "https://api.topazlabs.com/image/v1/enhance"
+    assert "//image/v1/enhance" not in url_with_slash