allow specifying expected response type

src/dataclass_rest/boundmethod.py

@@ -7,6 +7,7 @@
 from .exceptions import ClientLibraryError, MalformedResponse
 from .http_request import File, HttpRequest
 from .methodspec import MethodSpec
+from .response_type import ResponseType
 
 logger = getLogger(__name__)
 
@@ -18,11 +19,13 @@ def __init__(
         method_spec: MethodSpec,
         client: ClientProtocol,
         on_error: Optional[Callable[[Any], Any]],
+        response_type: ResponseType,
     ):
         self.name = name
         self.method_spec = method_spec
         self.client = client
         self.on_error = on_error or self._on_error_default
+        self.response_type = response_type
 
     def _apply_args(self, *args, **kwargs) -> Dict:
         return getcallargs(

src/dataclass_rest/http/aiohttp.py

@@ -20,6 +20,7 @@
     ServerError,
 )
 from dataclass_rest.http_request import HttpRequest
+from dataclass_rest.response_type import ResponseType
 
 
 class AiohttpMethod(AsyncMethod):
@@ -34,7 +35,16 @@ async def _release_raw_response(self, response: ClientResponse) -> None:
 
     async def _response_body(self, response: ClientResponse) -> Any:
         try:
-            return await response.json()
+            if self.response_type == ResponseType.JSON:
+                return await response.json()
+            elif self.response_type == ResponseType.TEXT:
+                return await response.text()
+            elif self.response_type == ResponseType.BYTES:
+                return await response.read()
+            elif self.response_type == ResponseType.NO_CONTENT:
+                return None
+            else:
+                raise ValueError("Unknown expected response type")
         except AioHttpClientError as e:
             raise ClientLibraryError from e
         except JSONDecodeError as e:

src/dataclass_rest/http/requests.py

@@ -13,6 +13,7 @@
     ServerError,
 )
 from dataclass_rest.http_request import File, HttpRequest
+from dataclass_rest.response_type import ResponseType
 
 
 class RequestsMethod(SyncMethod):
@@ -27,7 +28,16 @@ def _response_ok(self, response: Response) -> bool:
 
     def _response_body(self, response: Response) -> Any:
         try:
-            return response.json()
+            if self.response_type == ResponseType.JSON:
+                return response.json()
+            elif self.response_type == ResponseType.TEXT:
+                return response.text
+            elif self.response_type == ResponseType.BYTES:
+                return response.content
+            elif self.response_type == ResponseType.NO_CONTENT:
+                return None
+            else:
+                raise ValueError("Unknown expected response type")
         except RequestException as e:
             raise ClientLibraryError from e
         except JSONDecodeError as e:

src/dataclass_rest/method.py

@@ -3,16 +3,19 @@
 from .boundmethod import BoundMethod
 from .client_protocol import ClientProtocol
 from .methodspec import MethodSpec
+from .response_type import ResponseType
 
 
 class Method:
     def __init__(
         self,
         method_spec: MethodSpec,
+        response_type: ResponseType,
         method_class: Optional[Callable[..., BoundMethod]] = None,
     ):
         self.name = method_spec.func.__name__
         self.method_spec = method_spec
+        self.response_type = response_type
         self.method_class = method_class
         self._on_error = None
 
@@ -42,6 +45,7 @@ def __get__(
             method_spec=self.method_spec,
             client=instance,
             on_error=self._on_error,
+            response_type=self.response_type,
         )
 
     def on_error(self, func) -> "Method":

src/dataclass_rest/response_type.py

@@ -0,0 +1,10 @@
+from enum import Enum
+from typing import Literal
+
+class ResponseType(Enum):
+    JSON = "json"
+    TEXT = "text"
+    BYTES = "bytes"
+    NO_CONTENT = "no_content"
+
+ResponseTypeLiteral = Literal["json", "text", "bytes", "no_content"]

src/dataclass_rest/rest.py

@@ -3,6 +3,7 @@
 from .boundmethod import BoundMethod
 from .method import Method
 from .parse_func import DEFAULT_BODY_PARAM, UrlTemplate, parse_func
+from .response_type import ResponseTypeLiteral, ResponseType
 
 _Func = TypeVar("_Func", bound=Callable[..., Any])
 
@@ -15,9 +16,17 @@ def rest(
     additional_params: Optional[Dict[str, Any]] = None,
     method_class: Optional[Callable[..., BoundMethod]] = None,
     send_json: bool = True,
+    response_type: ResponseTypeLiteral = "json",
 ) -> Callable[[Callable], Method]:
     if additional_params is None:
         additional_params = {}
+    try:
+        response_type_enum = ResponseType(response_type)
+    except ValueError:
+        raise TypeError(
+            f"'{response_type}' is not a valid response type. "
+            f"Use one of {list(ResponseTypeLiteral.__args__)}"
+        )
 
     def dec(func: Callable) -> Method:
         method_spec = parse_func(
@@ -28,7 +37,7 @@ def dec(func: Callable) -> Method:
             additional_params=additional_params,
             is_json_request=send_json,
         )
-        return Method(method_spec, method_class=method_class)
+        return Method(method_spec, method_class=method_class, response_type=response_type_enum)
 
     return dec