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PO
primarykey
Id
7927454
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-10-28T09:29:35.627
FavoriteCount
0
LastActivityDate
2011-10-30T09:04:18.620
LastEditDate
2011-10-30T09:04:18.620
LastEditorUserId
0
OwnerUserId
0
ParentId
6949899
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
user811773
text
Body
The reason why your program sometimes panics is that it is sometimes writing to <code>w http.ResponseWriter</code> after the program exits the <code>load</code> function. The <code>http</code> package automatically closes the <code>http.ResponseWriter</code> when the program exits the handler function. In function <code>writeContent</code>, the program will sometimes attempt to write to a closed <code>http.ResponseWriter</code>. BTW: You can make the program source code much smaller if you use the <code>io.Copy</code> function. To always get predictable behavior, make sure that all work that you want the program to perform in response to a HTTP request is done before you exit the handler function. For example: <pre><code>func writeContent(w http.ResponseWriter, channel chan []byte) { fmt.Printf("ATTEMPTING TO WRITE CONTENT\n") for bytes := range channel { w.Write(bytes) fmt.Printf("BYTES RECEIVED\n") } fmt.Printf("FINISHED WRITING\n") } func load(w http.ResponseWriter, path string) { fmt.Printf("ATTEMPTING LOAD " + path + "\n") channel := make(chan []byte) workDone := make(chan byte) go func() { writeContent(w, channel) workDone <- 1 //Send an arbitrary value }() go func() { getContent(path, channel) workDone <- 2 //Send an arbitrary value }() <-workDone <-workDone } func handle(w http.ResponseWriter, r *http.Request) { fmt.Printf("HANDLING REQUEST FOR " + r.URL.Path[1:] + "\n") load(w, r.URL.Path[1:]) } </code></pre>
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1. POReading a local file in Google App Engine with Go
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1. POReading a local file in Google App Engine with Go
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