added .ErrHTTP() method so can detect these are these type of errors

badgateway.go

@@ -31,6 +31,10 @@ func (receiver internalBadGateway) Err() error {
 	return receiver.err
 }
 
+func (internalBadGateway) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalBadGateway) ServerError() {
 	// Nothing here.
 }

badrequest.go

@@ -29,6 +29,10 @@ func (receiver internalBadRequest) Err() error {
 	return receiver.err
 }
 
+func (internalBadRequest) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalBadRequest) ClientError() {
 	// Nothing here.
 }

conflict.go

@@ -29,6 +29,10 @@ func (receiver internalConflict) Err() error {
 	return receiver.err
 }
 
+func (internalConflict) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalConflict) ClientError() {
 	// Nothing here.
 }

error.go

@@ -3,5 +3,6 @@ package errhttp
 type Error interface {
 	error
 	Err() error
+	ErrHTTP()
 	Unwrap() error
 }

expectationfailed.go

@@ -29,6 +29,10 @@ func (receiver internalExpectationFailed) Err() error {
 	return receiver.err
 }
 
+func (internalExpectationFailed) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalExpectationFailed) ClientError() {
 	// Nothing here.
 }

faileddependency.go

@@ -29,6 +29,10 @@ func (receiver internalFailedDependency) Err() error {
 	return receiver.err
 }
 
+func (internalFailedDependency) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalFailedDependency) ClientError() {
 	// Nothing here.
 }

forbidden.go

@@ -29,6 +29,10 @@ func (receiver internalForbidden) Err() error {
 	return receiver.err
 }
 
+func (internalForbidden) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalForbidden) ClientError() {
 	// Nothing here.
 }

gatewaytimeout.go

@@ -31,6 +31,10 @@ func (receiver internalGatewayTimeout) Err() error {
 	return receiver.err
 }
 
+func (internalGatewayTimeout) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalGatewayTimeout) ServerError() {
 	// Nothing here.
 }

gone.go

@@ -29,6 +29,10 @@ func (receiver internalGone) Err() error {
 	return receiver.err
 }
 
+func (internalGone) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalGone) ClientError() {
 	// Nothing here.
 }

httpversionnotsupported.go

@@ -31,6 +31,10 @@ func (receiver internalHTTPVersionNotSupported) Err() error {
 	return receiver.err
 }
 
+func (internalHTTPVersionNotSupported) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalHTTPVersionNotSupported) ServerError() {
 	// Nothing here.
 }

insufficientstorage.go

@@ -31,6 +31,10 @@ func (receiver internalInsufficientStorage) Err() error {
 	return receiver.err
 }
 
+func (internalInsufficientStorage) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalInsufficientStorage) ServerError() {
 	// Nothing here.
 }

internalservererror.go

@@ -31,6 +31,10 @@ func (receiver internalInternalServerError) Err() error {
 	return receiver.err
 }
 
+func (internalInternalServerError) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalInternalServerError) ServerError() {
 	// Nothing here.
 }

lengthrequired.go

@@ -29,6 +29,10 @@ func (receiver internalLengthRequired) Err() error {
 	return receiver.err
 }
 
+func (internalLengthRequired) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalLengthRequired) ClientError() {
 	// Nothing here.
 }

locked.go

@@ -29,6 +29,10 @@ func (receiver internalLocked) Err() error {
 	return receiver.err
 }
 
+func (internalLocked) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalLocked) ClientError() {
 	// Nothing here.
 }

loopdetected.go

@@ -31,6 +31,10 @@ func (receiver internalLoopDetected) Err() error {
 	return receiver.err
 }
 
+func (internalLoopDetected) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalLoopDetected) ServerError() {
 	// Nothing here.
 }

methodnotallowed.go

@@ -29,6 +29,10 @@ func (receiver internalMethodNotAllowed) Err() error {
 	return receiver.err
 }
 
+func (internalMethodNotAllowed) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalMethodNotAllowed) ClientError() {
 	// Nothing here.
 }

networkauthenticationrequired.go

@@ -31,6 +31,10 @@ func (receiver internalNetworkAuthenticationRequired) Err() error {
 	return receiver.err
 }
 
+func (internalNetworkAuthenticationRequired) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalNetworkAuthenticationRequired) ServerError() {
 	// Nothing here.
 }

notacceptable.go

@@ -29,6 +29,10 @@ func (receiver internalNotAcceptable) Err() error {
 	return receiver.err
 }
 
+func (internalNotAcceptable) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalNotAcceptable) ClientError() {
 	// Nothing here.
 }

notextended.go

@@ -31,6 +31,10 @@ func (receiver internalNotExtended) Err() error {
 	return receiver.err
 }
 
+func (internalNotExtended) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalNotExtended) ServerError() {
 	// Nothing here.
 }

notfound.go

@@ -29,6 +29,10 @@ func (receiver internalNotFound ) Err() error {
 	return receiver.err
 }
 
+func (internalNotFound ) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalNotFound ) ClientError() {
 	// Nothing here.
 }

notimplemented.go

@@ -31,6 +31,10 @@ func (receiver internalNotImplemented) Err() error {
 	return receiver.err
 }
 
+func (internalNotImplemented) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalNotImplemented) ServerError() {
 	// Nothing here.
 }

payloadtoolarge.go

@@ -29,6 +29,10 @@ func (receiver internalPayloadTooLarge) Err() error {
 	return receiver.err
 }
 
+func (internalPayloadTooLarge) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalPayloadTooLarge) ClientError() {
 	// Nothing here.
 }

paymentrequired.go

@@ -29,6 +29,11 @@ func (receiver internalPaymentRequired) Err() error {
 	return receiver.err
 }
 
+func (internalPaymentRequired) ErrHTTP() {
+	// Nothing here.
+}
+
+
 func (internalPaymentRequired) ClientError() {
 	// Nothing here.
 }

preconditionfailed.go

@@ -29,6 +29,10 @@ func (receiver internalPreconditionFailed) Err() error {
 	return receiver.err
 }
 
+func (internalPreconditionFailed) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalPreconditionFailed) ClientError() {
 	// Nothing here.
 }

preconditionrequired.go

@@ -29,6 +29,10 @@ func (receiver internalPreconditionRequired) Err() error {
 	return receiver.err
 }
 
+func (internalPreconditionRequired) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalPreconditionRequired) ClientError() {
 	// Nothing here.
 }

proxyauthrequired.go

@@ -29,6 +29,10 @@ func (receiver internalProxyAuthRequired) Err() error {
 	return receiver.err
 }
 
+func (internalProxyAuthRequired) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalProxyAuthRequired) ClientError() {
 	// Nothing here.
 }

requestedrangenotsatisfiable.go

@@ -29,6 +29,10 @@ func (receiver internalRequestedRangeNotSatisfiable) Err() error {
 	return receiver.err
 }
 
+func (internalRequestedRangeNotSatisfiable) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalRequestedRangeNotSatisfiable) ClientError() {
 	// Nothing here.
 }

requestentitytoolarge.go

@@ -29,6 +29,10 @@ func (receiver internalRequestEntityTooLarge) Err() error {
 	return receiver.err
 }
 
+func (internalRequestEntityTooLarge) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalRequestEntityTooLarge) ClientError() {
 	// Nothing here.
 }

requestheaderfieldstoolarge.go

@@ -30,6 +30,10 @@ func (receiver internalRequestHeaderFieldsTooLarge) Err() error {
 	return receiver.err
 }
 
+func (internalRequestHeaderFieldsTooLarge) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalRequestHeaderFieldsTooLarge) ClientError() {
 	// Nothing here.
 }

requesttimeout.go

@@ -30,6 +30,10 @@ func (receiver internalRequestTimeout) Err() error {
 	return receiver.err
 }
 
+func (internalRequestTimeout) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalRequestTimeout) ClientError() {
 	// Nothing here.
 }

requesturitoolong.go

@@ -30,6 +30,10 @@ func (receiver internalRequestURITooLong) Err() error {
 	return receiver.err
 }
 
+func (internalRequestURITooLong) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalRequestURITooLong) ClientError() {
 	// Nothing here.
 }

serviceunavailable.go

@@ -29,6 +29,10 @@ func (receiver internalServiceUnavailable) Err() error {
 	return receiver.err
 }
 
+func (internalServiceUnavailable) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalServiceUnavailable) ServerError() {
 	// Nothing here.
 }

teapot.go

@@ -29,6 +29,10 @@ func (receiver internalTeapot) Err() error {
 	return receiver.err
 }
 
+func (internalTeapot) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalTeapot) ClientError() {
 	// Nothing here.
 }

toomanyrequests.go

@@ -29,6 +29,10 @@ func (receiver internalTooManyRequests) Err() error {
 	return receiver.err
 }
 
+func (internalTooManyRequests) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalTooManyRequests) ClientError() {
 	// Nothing here.
 }

unauthorized.go

@@ -29,6 +29,10 @@ func (receiver internalUnauthorized) Err() error {
 	return receiver.err
 }
 
+func (internalUnauthorized) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalUnauthorized) ClientError() {
 	// Nothing here.
 }

unavailableforlegalreasons.go

@@ -29,6 +29,10 @@ func (receiver internalUnavailableForLegalReasons) Err() error {
 	return receiver.err
 }
 
+func (internalUnavailableForLegalReasons) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalUnavailableForLegalReasons) ClientError() {
 	// Nothing here.
 }

unprocessableentity.go

@@ -29,6 +29,10 @@ func (receiver internalUnprocessableEntity) Err() error {
 	return receiver.err
 }
 
+func (internalUnprocessableEntity) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalUnprocessableEntity) ClientError() {
 	// Nothing here.
 }

unsupportedmediatype.go

@@ -29,6 +29,10 @@ func (receiver internalUnsupportedMediaType) Err() error {
 	return receiver.err
 }
 
+func (internalUnsupportedMediaType) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalUnsupportedMediaType) ClientError() {
 	// Nothing here.
 }

upgraderequired.go

@@ -29,6 +29,10 @@ func (receiver internalUpgradeRequired) Err() error {
 	return receiver.err
 }
 
+func (internalUpgradeRequired) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalUpgradeRequired) ClientError() {
 	// Nothing here.
 }

uritoolong.go

@@ -29,6 +29,10 @@ func (receiver internalURITooLong) Err() error {
 	return receiver.err
 }
 
+func (internalURITooLong) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalURITooLong) ClientError() {
 	// Nothing here.
 }

variantaisonegotiates.go

@@ -31,6 +31,10 @@ func (receiver internalVariantAlsoNegotiates) Err() error {
 	return receiver.err
 }
 
+func (internalVariantAlsoNegotiates) ErrHTTP() {
+	// Nothing here.
+}
+
 func (internalVariantAlsoNegotiates) ServerError() {
 	// Nothing here.
 }