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-rw-r--r--manual/cowboy_req.md16
1 files changed, 16 insertions, 0 deletions
diff --git a/manual/cowboy_req.md b/manual/cowboy_req.md
index 1667311..c7e2180 100644
--- a/manual/cowboy_req.md
+++ b/manual/cowboy_req.md
@@ -19,6 +19,10 @@ ignore any previous you may have had. This value contains various
state informations which are necessary for Cowboy to do some lazy
evaluation or cache results where appropriate.
+All functions which perform an action should only be called once.
+This includes reading the request body or replying. Cowboy will
+generally throw an error on the second call.
+
Types
-----
@@ -329,6 +333,9 @@ Request body related exports
> body was sent using the chunked transfer-encoding. It will
> also return `{error, badlength}` if the length of the body
> exceeds the given `MaxLength`, which is 8MB by default.
+>
+> This function can only be called once. Cowboy will not cache
+> the result of this call.
### body_length(Req) -> {Length, Req2}
@@ -360,6 +367,9 @@ Request body related exports
> body was sent using the chunked transfer-encoding. It will
> also return `{error, badlength}` if the length of the body
> exceeds the given `MaxLength`, which is 16KB by default.
+>
+> This function can only be called once. Cowboy will not cache
+> the result of this call.
### has_body(Req) -> boolean()
@@ -464,6 +474,9 @@ Response related exports
> If the request uses HTTP/1.0, the data is sent directly
> without wrapping it in an HTTP/1.1 chunk, providing
> compatibility with older clients.
+>
+> This function can only be called once, with the exception
+> of overriding the response in the `onresponse` hook.
### delete_resp_header(Name, Req) -> Req2
@@ -516,6 +529,9 @@ Response related exports
>
> No more data can be sent to the client after this function
> returns.
+>
+> This function can only be called once, with the exception
+> of overriding the response in the `onresponse` hook.
### set_resp_body(Body, Req) -> Req2