allow to override content-type

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.mod

@@ -2,4 +2,4 @@ module github.com/unistack-org/micro-client-http/v3
 
 go 1.16
 
-require github.com/unistack-org/micro/v3 v3.3.3
+require github.com/unistack-org/micro/v3 v3.3.12

go.sum

@@ -5,11 +5,11 @@ github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+
 github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-github.com/unistack-org/micro/v3 v3.3.3 h1:Igkzl8tWPlIacEK9z8hHVIzhdyzi8drQPt0Am2iHAcA=
+github.com/unistack-org/micro/v3 v3.3.12 h1:3CZsjskLlu2MG3uW5A3e++KDaFdUNlGS/Ck+sGhtHL4=
-github.com/unistack-org/micro/v3 v3.3.3/go.mod h1:tX95c0Qx4w6oqU7qKThs9lya9P507BdZ29MsTVDmU6w=
+github.com/unistack-org/micro/v3 v3.3.12/go.mod h1:98hNcMXp/WyWJwLwCuwrhN1Jm7aCWaRNsMfRjK8Fq+Y=
-golang.org/x/net v0.0.0-20210324205630-d1beb07c2056/go.mod h1:uSPa2vr4CLtc/ILN5odXGNXS6mhrKVzTaCXzk9m6W3k=
+golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210324051608-47abb6519492/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

http.go

@@ -19,6 +19,7 @@ import (
 	"github.com/unistack-org/micro/v3/errors"
 	"github.com/unistack-org/micro/v3/metadata"
 	"github.com/unistack-org/micro/v3/router"
+	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
 var (
@@ -98,13 +99,24 @@ func newRequest(addr string, req client.Request, ct string, cf codec.Codec, msg
 		return nil, errors.BadRequest("go.micro.client", err.Error())
 	}
 
-	// marshal request is struct not empty
+	var b []byte
+
 	if nmsg != nil {
-		var b []byte
+		if ct == "application/x-www-form-urlencoded" {
-		b, err = cf.Marshal(nmsg)
+			data, err := rutil.StructURLValues(nmsg, "", tags)
-		if err != nil {
+			if err != nil {
-			return nil, errors.BadRequest("go.micro.client", err.Error())
+				return nil, errors.BadRequest("go.micro.client", err.Error())
+			}
+			b = []byte(data.Encode())
+		} else {
+			b, err = cf.Marshal(nmsg)
+			if err != nil {
+				return nil, errors.BadRequest("go.micro.client", err.Error())
+			}
 		}
+	}
+
+	if len(b) > 0 {
 		hreq.Body = ioutil.NopCloser(bytes.NewBuffer(b))
 		hreq.ContentLength = int64(len(b))
 	}
@@ -114,21 +126,32 @@ func newRequest(addr string, req client.Request, ct string, cf codec.Codec, msg
 
 func (h *httpClient) call(ctx context.Context, addr string, req client.Request, rsp interface{}, opts client.CallOptions) error {
 	header := make(http.Header, 2)
-	if md, ok := metadata.FromContext(ctx); ok {
+	if md, ok := metadata.FromOutgoingContext(ctx); ok {
 		for k, v := range md {
 			header.Set(k, v)
 		}
 	}
 
 	ct := req.ContentType()
+	if len(opts.ContentType) > 0 {
+		ct = opts.ContentType
+	}
 
 	// set timeout in nanoseconds
 	header.Set("Timeout", fmt.Sprintf("%d", opts.RequestTimeout))
 	// set the content type for the request
 	header.Set("Content-Type", ct)
 
+	var cf codec.Codec
+	var err error
 	// get codec
-	cf, err := h.newCodec(ct)
+	switch ct {
+	case "application/x-www-form-urlencoded":
+		cf, err = h.newCodec(DefaultContentType)
+	default:
+		cf, err = h.newCodec(ct)
+	}
+
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
@@ -164,7 +187,7 @@ func (h *httpClient) call(ctx context.Context, addr string, req client.Request,
 func (h *httpClient) stream(ctx context.Context, addr string, req client.Request, opts client.CallOptions) (client.Stream, error) {
 	var header http.Header
 
-	if md, ok := metadata.FromContext(ctx); ok {
+	if md, ok := metadata.FromOutgoingContext(ctx); ok {
 		header = make(http.Header, len(md)+2)
 		for k, v := range md {
 			header.Set(k, v)
@@ -174,6 +197,10 @@ func (h *httpClient) stream(ctx context.Context, addr string, req client.Request
 	}
 
 	ct := req.ContentType()
+	if len(opts.ContentType) > 0 {
+		ct = opts.ContentType
+	}
+
 	// set timeout in nanoseconds
 	header.Set("Timeout", fmt.Sprintf("%d", opts.RequestTimeout))
 	// set the content type for the request
@@ -255,8 +282,8 @@ func (h *httpClient) NewMessage(topic string, msg interface{}, opts ...client.Me
 	return newHTTPMessage(topic, msg, h.opts.ContentType, opts...)
 }
 
-func (h *httpClient) NewRequest(service, method string, req interface{}, reqOpts ...client.RequestOption) client.Request {
+func (h *httpClient) NewRequest(service, method string, req interface{}, opts ...client.RequestOption) client.Request {
-	return newHTTPRequest(service, method, req, h.opts.ContentType, reqOpts...)
+	return newHTTPRequest(service, method, req, h.opts.ContentType, opts...)
 }
 
 func (h *httpClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
@@ -525,7 +552,7 @@ func (h *httpClient) Stream(ctx context.Context, req client.Request, opts ...cli
 func (h *httpClient) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
 	options := client.NewPublishOptions(opts...)
 
-	md, ok := metadata.FromContext(ctx)
+	md, ok := metadata.FromOutgoingContext(ctx)
 	if !ok {
 		md = metadata.New(2)
 	}
@@ -598,6 +625,7 @@ func NewClient(opts ...client.Option) client.Client {
 	if httpcli, ok := options.Context.Value(httpClientKey{}).(*http.Client); ok {
 		rc.httpcli = httpcli
 	} else {
+		// TODO customTransport := http.DefaultTransport.(*http.Transport).Clone()
 		tr := &http.Transport{
 			Proxy:                 http.ProxyFromEnvironment,
 			DialContext:           dialer.DialContext,

util.go

@@ -87,6 +87,10 @@ func newPathRequest(path string, method string, body string, msg interface{}, ta
 			t.name = strings.ToLower(fld.Name)
 		}
 
+		if !val.IsValid() || val.IsZero() {
+			continue
+		}
+
 		if _, ok := fieldsmap[t.name]; ok {
 			fieldsmap[t.name] = fmt.Sprintf("%v", val.Interface())
 		} else if (body == "*" || body == t.name) && method != http.MethodGet {
@@ -156,15 +160,23 @@ func newTemplate(path string) (util.Template, error) {
 }
 
 func parseRsp(ctx context.Context, hrsp *http.Response, cf codec.Codec, rsp interface{}, opts client.CallOptions) error {
+	// fast path return
+	if hrsp.StatusCode == http.StatusNoContent {
+		return nil
+	}
+
 	b, err := ioutil.ReadAll(hrsp.Body)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", err.Error())
 	}
 
 	if hrsp.StatusCode < 400 {
-		// unmarshal
+		// unmarshal only if body not nil
-		if err := cf.Unmarshal(b, rsp); err != nil {
+		if len(b) > 0 {
-			return errors.InternalServerError("go.micro.client", err.Error())
+			// unmarshal
+			if err := cf.Unmarshal(b, rsp); err != nil {
+				return errors.InternalServerError("go.micro.client", err.Error())
+			}
 		}
 		return nil
 	}
@@ -183,8 +195,12 @@ func parseRsp(ctx context.Context, hrsp *http.Response, cf codec.Codec, rsp inte
 		return errors.New("go.micro.client", string(b), int32(hrsp.StatusCode))
 	}
 
-	if cerr := cf.Unmarshal(b, err); cerr != nil {
+	if len(b) > 0 {
-		return errors.InternalServerError("go.micro.client", cerr.Error())
+		if cerr := cf.Unmarshal(b, err); cerr != nil {
+			err = errors.InternalServerError("go.micro.client", cerr.Error())
+		}
+	} else {
+		err = errors.New("go.micro.client", string(b), int32(hrsp.StatusCode))
 	}
 
 	return err