diff --git a/trunk/src/app/srs_app_http.cpp b/trunk/src/app/srs_app_http.cpp
index bb858032e..2be383c0d 100644
--- a/trunk/src/app/srs_app_http.cpp
+++ b/trunk/src/app/srs_app_http.cpp
@@ -53,6 +53,9 @@ using namespace std;
 #define SRS_CONSTS_HTTP_PUT HTTP_PUT
 #define SRS_CONSTS_HTTP_DELETE HTTP_DELETE
 
+// for ead all of http body, read each time.
+#define SRS_HTTP_READ_CACHE_BYTES 4096
+
 #define SRS_HTTP_DEFAULT_PAGE "index.html"
 
 int srs_go_http_response_json(ISrsHttpResponseWriter* w, string data)
@@ -889,7 +892,8 @@ SrsHttpResponseReader::SrsHttpResponseReader(SrsHttpMessage* msg, SrsStSocket* i
     skt = io;
     owner = msg;
     is_eof = false;
-    nb_read = 0;
+    nb_total_read = 0;
+    nb_left_chunk = 0;
     buffer = NULL;
 }
 
@@ -901,6 +905,8 @@ int SrsHttpResponseReader::initialize(SrsFastBuffer* body)
 {
     int ret = ERROR_SUCCESS;
     
+    nb_left_chunk = 0;
+    nb_total_read = 0;
     buffer = body;
     
     return ret;
@@ -911,7 +917,7 @@ bool SrsHttpResponseReader::eof()
     return is_eof;
 }
 
-int SrsHttpResponseReader::read(std::string& data)
+int SrsHttpResponseReader::read(char* data, int nb_data, int* nb_read)
 {
     int ret = ERROR_SUCCESS;
     
@@ -923,95 +929,115 @@ int SrsHttpResponseReader::read(std::string& data)
     
     // chunked encoding.
     if (owner->is_chunked()) {
-        return read_chunked(data);
+        return read_chunked(data, nb_data, nb_read);
     }
     
     // read by specified content-length
-    int max = (int)owner->content_length() - (int)nb_read;
+    int max = (int)owner->content_length() - (int)nb_total_read;
     if (max <= 0) {
         is_eof = true;
         return ret;
     }
-    return read_specified(max, data);
+    
+    // change the max to read.
+    nb_data = srs_min(nb_data, max);
+    return read_specified(data, nb_data, nb_read);
 }
 
-int SrsHttpResponseReader::read_chunked(std::string& data)
+int SrsHttpResponseReader::read_chunked(char* data, int nb_data, int* nb_read)
 {
     int ret = ERROR_SUCCESS;
     
+    // when no bytes left in chunk,
     // parse the chunk length first.
-    char* at = NULL;
-    int length = 0;
-    while (!at) {
-        // find the CRLF of chunk header end.
-        char* start = buffer->bytes();
-        char* end = start + buffer->size();
-        for (char* p = start; p < end - 1; p++) {
-            if (p[0] == SRS_HTTP_CR && p[1] == SRS_HTTP_LF) {
-                // invalid chunk, ignore.
-                if (p == start) {
-                    ret = ERROR_HTTP_INVALID_CHUNK_HEADER;
-                    srs_error("chunk header start with CRLF. ret=%d", ret);
-                    return ret;
+    if (nb_left_chunk <= 0) {
+        char* at = NULL;
+        int length = 0;
+        while (!at) {
+            // find the CRLF of chunk header end.
+            char* start = buffer->bytes();
+            char* end = start + buffer->size();
+            for (char* p = start; p < end - 1; p++) {
+                if (p[0] == SRS_HTTP_CR && p[1] == SRS_HTTP_LF) {
+                    // invalid chunk, ignore.
+                    if (p == start) {
+                        ret = ERROR_HTTP_INVALID_CHUNK_HEADER;
+                        srs_error("chunk header start with CRLF. ret=%d", ret);
+                        return ret;
+                    }
+                    length = (int)(p - start + 2);
+                    at = buffer->read_slice(length);
+                    break;
                 }
-                length = (int)(p - start + 2);
-                at = buffer->read_slice(length);
+            }
+            
+            // got at, ok.
+            if (at) {
                 break;
             }
-        }
-        
-        // got at, ok.
-        if (at) {
-            break;
-        }
-        
-        // when empty, only grow 1bytes, but the buffer will cache more.
-        if ((ret = buffer->grow(skt, buffer->size() + 1)) != ERROR_SUCCESS) {
-            if (!srs_is_client_gracefully_close(ret)) {
-                srs_error("read body from server failed. ret=%d", ret);
+            
+            // when empty, only grow 1bytes, but the buffer will cache more.
+            if ((ret = buffer->grow(skt, buffer->size() + 1)) != ERROR_SUCCESS) {
+                if (!srs_is_client_gracefully_close(ret)) {
+                    srs_error("read body from server failed. ret=%d", ret);
+                }
+                return ret;
             }
+        }
+        srs_assert(length >= 3);
+        
+        // it's ok to set the pos and pos+1 to NULL.
+        at[length - 1] = 0;
+        at[length - 2] = 0;
+        
+        // size is the bytes size, excludes the chunk header and end CRLF.
+        int ilength = (int)::strtol(at, NULL, 16);
+        if (ilength < 0) {
+            ret = ERROR_HTTP_INVALID_CHUNK_HEADER;
+            srs_error("chunk header negative, length=%d. ret=%d", ilength, ret);
             return ret;
         }
+        
+        // all bytes in chunk is left now.
+        nb_left_chunk = ilength;
     }
-    srs_assert(length >= 3);
     
-    // it's ok to set the pos and pos+1 to NULL.
-    at[length - 1] = 0;
-    at[length - 2] = 0;
+    // left bytes in chunk, read some.
+    srs_assert(nb_left_chunk);
     
-    // size is the bytes size, excludes the chunk header and end CRLF.
-    int ilength = (int)::strtol(at, NULL, 16);
-    if (ilength < 0) {
-        ret = ERROR_HTTP_INVALID_CHUNK_HEADER;
-        srs_error("chunk header negative, length=%d. ret=%d", ilength, ret);
+    int nb_bytes = srs_min(nb_left_chunk, nb_data);
+    ret = read_specified(data, nb_bytes, &nb_bytes);
+    
+    // the nb_bytes used for output already read size of bytes.
+    if (nb_read) {
+        *nb_read = nb_bytes;
+    }
+    nb_left_chunk -= nb_bytes;
+    
+    // error or still left bytes in chunk, ignore and read in future.
+    if (nb_left_chunk > 0 || (ret != ERROR_SUCCESS)) {
         return ret;
     }
-    
-    // when empty, only grow 1bytes, but the buffer will cache more.
-    if ((ret = buffer->grow(skt, ilength + 2)) != ERROR_SUCCESS) {
-        if (!srs_is_client_gracefully_close(ret)) {
-            srs_error("read body from server failed. ret=%d", ret);
-        }
-        return ret;
-    }
-    srs_info("http: read %d chunk", ilength);
+    srs_info("http: read %d bytes of chunk", nb_bytes);
     
     // read payload when length specifies some payload.
-    if (ilength <= 0) {
+    if (nb_left_chunk <= 0) {
         is_eof = true;
-    } else {
-        srs_assert(ilength);
-        data.append(buffer->read_slice(ilength), ilength);
-        nb_read += ilength;
     }
     
     // the CRLF of chunk payload end.
+    if ((ret = buffer->grow(skt, 2)) != ERROR_SUCCESS) {
+        if (!srs_is_client_gracefully_close(ret)) {
+            srs_error("read EOF of chunk from server failed. ret=%d", ret);
+        }
+        return ret;
+    }
     buffer->read_slice(2);
 
     return ret;
 }
 
-int SrsHttpResponseReader::read_specified(int max, std::string& data)
+int SrsHttpResponseReader::read_specified(char* data, int nb_data, int* nb_read)
 {
     int ret = ERROR_SUCCESS;
     
@@ -1025,14 +1051,21 @@ int SrsHttpResponseReader::read_specified(int max, std::string& data)
         }
     }
     
-    int nb_bytes = srs_min(max, buffer->size());
+    int nb_bytes = srs_min(nb_data, buffer->size());
     
+    // read data to buffer.
     srs_assert(nb_bytes);
-    data.append(buffer->read_slice(nb_bytes), nb_bytes);
-    nb_read += nb_bytes;
+    char* p = buffer->read_slice(nb_bytes);
+    memcpy(data, p, nb_bytes);
+    if (nb_read) {
+        *nb_read = nb_bytes;
+    }
+    
+    // increase the total read to determine whether EOF.
+    nb_total_read += nb_bytes;
     
     // when read completed, eof.
-    if (nb_read >= (int)owner->content_length()) {
+    if (nb_total_read >= (int)owner->content_length()) {
         is_eof = true;
     }
     
@@ -1223,11 +1256,19 @@ int SrsHttpMessage::body_read_all(string& body)
 {
     int ret = ERROR_SUCCESS;
     
+    // cache to read.
+    char* buf = new char[SRS_HTTP_READ_CACHE_BYTES];
+    SrsAutoFree(char, buf);
+    
     // whatever, read util EOF.
     while (!_body->eof()) {
-        if ((ret = _body->read(body)) != ERROR_SUCCESS) {
+        int nb_read = 0;
+        if ((ret = _body->read(buf, SRS_HTTP_READ_CACHE_BYTES, &nb_read)) != ERROR_SUCCESS) {
             return ret;
         }
+        
+        srs_assert (nb_read > 0);
+        body.append(buf, nb_read);
     }
     
     return ret;
diff --git a/trunk/src/app/srs_app_http.hpp b/trunk/src/app/srs_app_http.hpp
index bc524666e..76cf602da 100644
--- a/trunk/src/app/srs_app_http.hpp
+++ b/trunk/src/app/srs_app_http.hpp
@@ -196,10 +196,13 @@ public:
     */
     virtual bool eof() = 0;
     /**
-    * read from the response body.
-    * @remark when eof(), return error.
-    */
-    virtual int read(std::string& data) = 0;
+     * read from the response body.
+     * @param data, the buffer to read data buffer to.
+     * @param nb_data, the max size of data buffer.
+     * @param nb_read, the actual read size of bytes. NULL to ignore.
+     * @remark when eof(), return error.
+     */
+    virtual int read(char* data, int nb_data, int* nb_read) = 0;
 };
 
 // Objects implementing the Handler interface can be
@@ -431,7 +434,10 @@ private:
     SrsHttpMessage* owner;
     SrsFastBuffer* buffer;
     bool is_eof;
-    int64_t nb_read;
+    // the left bytes in chunk.
+    int nb_left_chunk;
+    // already read total bytes.
+    int64_t nb_total_read;
 public:
     SrsHttpResponseReader(SrsHttpMessage* msg, SrsStSocket* io);
     virtual ~SrsHttpResponseReader();
@@ -443,10 +449,10 @@ public:
 // interface ISrsHttpResponseReader
 public:
     virtual bool eof();
-    virtual int read(std::string& data);
+    virtual int read(char* data, int nb_data, int* nb_read);
 private:
-    virtual int read_chunked(std::string& data);
-    virtual int read_specified(int max, std::string& data);
+    virtual int read_chunked(char* data, int nb_data, int* nb_read);
+    virtual int read_specified(char* data, int nb_data, int* nb_read);
 };
 
 // for http header.
diff --git a/trunk/src/app/srs_app_http_hooks.cpp b/trunk/src/app/srs_app_http_hooks.cpp
index 7824a6978..c262ba07f 100644
--- a/trunk/src/app/srs_app_http_hooks.cpp
+++ b/trunk/src/app/srs_app_http_hooks.cpp
@@ -363,17 +363,16 @@ int SrsHttpHooks::on_hls_notify(std::string url, SrsRequest* req, std::string ts
     }
     SrsAutoFree(SrsHttpMessage, msg);
     
+    int nb_read = 0;
     ISrsHttpResponseReader* br = msg->body_reader();
-    while (!br->eof()) {
-        std::string data;
-        // for notify, only read some data.
-        ret = br->read(data);
-        break;
+    if (!br->eof()) {
+        char buf[64]; // only read a little of bytes of ts.
+        ret = br->read(buf, 64, &nb_read);
     }
     
     int spenttime = (int)(srs_update_system_time_ms() - starttime);
-    srs_trace("http hook on_hls_notify success. client_id=%d, url=%s, code=%d, spent=%dms, ret=%d",
-        client_id, url.c_str(), msg->status_code(), spenttime, ret);
+    srs_trace("http hook on_hls_notify success. client_id=%d, url=%s, code=%d, spent=%dms, read=%dB, ret=%d",
+        client_id, url.c_str(), msg->status_code(), spenttime, nb_read, ret);
     
     // ignore any error for on_hls_notify.
     ret = ERROR_SUCCESS;